nitrates are driving me up the wall
 

Any idea on how to get my nitrates down, 100g tank. Livestock consists of 1 yellow tang 4", 1 regal tang 3 1/2" ,2 clowns, 2 chromis, and 5 blue devils, 2 shrimp, 1 lobster, assort crabs, and 4-5 snails. all livestock other than the damsels are 1-5 years old. I only use RO water. My nitrates are consistently between 10-20 ppm. Regular water changes 160 gallons in 2 months. I have no filter media, skimmer is skimming the best it ever has. I have no hair algae but the brown and purple diatoms on the sand are constantly there. And I do not overfeed, however there main staple is mysis shrimp, which I rinse first and drain off. Once a day, and once a day Tangs get sea veggies, (other fish eat it too. As for the corals they get reef roids once a week. HELP PLEEEAAASSSSEEE :twised:,:twised:,:twised:

What brand of test kit? How old is it or when is the "best before date"? What kind of skimmer? How long has this tank been setup? How old is the live rock? what the live rock bought from a previously setup tank? Is it all live rock or was some of it dry base rock? Do you run GFO? If so, what brand, how much, and how often do you change it out? If not, consider adding one in a reactor and use any of the brown GFOs, not the white kind.

It will help if you replace half the feedings with flake or pellet instead of frozen foods as they are loaded with phosphates and nitrates. The "purple diatoms" is probably cyanobacteria, not an algae. Both diatoms and cyano are caused by excess nutrients.

What kind of corals do you have? Consider skipping out on the Reef Roids until your parameters are back under control.

Test it is a hagen Test tube style not the strips. I replace mini bottles as I use them. Live rock was from an existing aquarium I moved up from a 50 to 100g a year ago march. What is GFO? I am a relative newbie to the forum. Thanks for the heads up on the mysis As for the skimmer I cant remember the brand but I asked about it recently at a LFS and it is more than capable for my setup.
As far as corals, frogspawn x2, hammer coral, bubble coral, acan lorde, brain coral, a couple different finger leathers, 3 different types of zoas, and a plate type coral that the name escapes me. I might have missed somethings, but that is basically it.

Ok. Try taking a sample of your water to the LFS for testing. Hopefully they will use either a Salifert or Elos kit to test it, and see if your readings are accurate. I have found Hagen kits to be fairly inaccurate.

GFO = granulated ferric oxide. It absorbs phosphates. This will help with the diatoms and cyano.

Please take a peek at your skimmer and find out the brand name and model, or take a picture of it and maybe we can identify it. Unfortunately, many (probably most) LFS employees are inexperienced and I do not trust their judgement without talking to them myself.

As for the corals, the bubble, acan and brain will all accept target feedings of mysis shrimp. The rest do not need to be fed. I would suggest either target feeding or not feeding them at all, but to avoid feeding the water column with the Reef Roids as too much ends up in nooks and crannies instead of in the corals' mouths so it lies and rots, and creates waste.

nitrate
 

My skimmer is and all seas g series. Getting the local fish stores to test, The 2 I most frequent, one uses the hagen kit same as mine, and the other uses the test strips, which I know are far less accurate.
I will discontinue the reef roids and switch to flake food for the fish with only occasional mysis feedings maybe twice a week.
I will also try the GFO



thanks again Rob

I highly disagree with the flake food. Un-eatin portions will quickly dissolve into the water column becoming food for algae. Diatoms and red slime can also be a product of poor flow at the bottom of the tank. KZ (pohl's) makes a product called "coral snow" that helped make a huge dent in my diatoms. Do try and find either a salifert or elos test kit....or at the very least API....hagen kits are best left for the freshwater tank....or at the store.

Rob shouldn't be feeding enough flake for it to hit the sand or the rocks. I know my fish all come out for food, and there's no way they miss a thing. Definitely a lot cleaner than feeding frozen foods. When I've had fish that don't come out for food (like jawfish) I have target fed them with a turkey baster. Most (yep I said most) people have poor feeding techniques, and this is often a significant contributing factor to nuisance algaes. Most people overfeed.

Adding more flow near the sand is a good idea. :)

So other than the nitrate readings being what they are, how is your tank doing? Doesn't sound like you have any major problems other than the nitrate readings themselves driving you up the wall. The diatoms on the sand can be taken care of with an occasional blasting from a turkey baster to put them into suspension. Your skimmer will take care of the rest.

I've had my 75 for about two & a half years now and recall some ups and downs with nitrates. My set up as far as tank & live rock is all from previous owners and there wasn't much of a cycle to speak of on initial set up. Subsequently there was a period of slightly elevated nitrates, then they dropped to 0 only to come back up to about what you're experiencing at about the 1 year mark. No matter what I tried, I couldn't get them down, drove me up the wall. However, none of my livestock appeared to be suffering or stressed, although I didn't have much in the way of corals. Not long after scoring some Chaetomorpha algae (thank you Myka) and adding a VorTech for water movement, the nitrates gradually became undetectable.

I'm too new at this to provide expert advice in this regard, but this has been my experience. Not sure whether it was the Chaeto, additional flow or just the system itself maturing to the point where the biological balance was at the point of taking care of whatever nutrients were causing the elevated nitrates. Might be a combination of a number of factors. Each system is more or less unique, don't let nitrates drive you up the wall. Keep an eye on your livestock and general tank condition, water changes and some macro algae should eventually take care of it.

Other factors noteworthy from my experience:

I feed what many folks would consider generously, I don't like to starve my fish at the expense of a super low nutrient system. I feed frozen, granular as well as flake and any changes I've tried to make in that regard did not appear to impact my nitrate readings significantly;

I now have a few coral specimens, softies and several LPS;

I've only recently changed to using RO/DI from treated tap water and must say, that was a wise move as this has cut down on algae issues;

I have run GFO in a canister filter (I don't have a sump at this time) but it appeared to have nil effect in phosphate readings, these have always been very low in my system. I still run a small amount of carbon in my canister which is otherwise empty;

My skimmer is definitely old school, DIY air stone, counter current but it works well, is quiet and uses little power.

At any rate, I'm confident in saying I have yet to lose any livestock due to elevated Nitrates (when they were elevated), so I'm not sure a reading even up to 20 ppm is all that harmful, other than stressing the system owner. SPS dominated system owners obviously need to aim for better numbers than that. You mention that you do not have a hair algae problem so that's a bonus. I admit that that has been an issue with me in varying degrees. I believe the change to RO/DI will gradually take care of that. Good luck with your system and I wouldn't change too much too fast due to your nitrate readings. Keep an eye on the livestock more than anything as an indicator of system health and give it more time.

Good advice Mike!

nitrates
 

I literally have no algae, all the fish are healthy, the clowns lay eggs every 2 weeks unless I **** them off with a good tank cleaning seems to disrupt there cycle. Corals are all growing especially the mushrooms. No my biggest issue is the water changes. I use to do 5-10% a week and my nitrates just started to come on. now I am at 25-30% almost weekly and am getting tired of getting nowhere with it. Its expensive. I use ocean pro salt and bottled water. Where do I draw the line do I go back to 10g a week and watch how high the nitrates climb? or do I keep spending $250.00 a month on water changes. Thanks for the input I will definitely consider several things mentioned