Save my tank!

[Aquattro]

CA should be higher than 330. At least 380, preferably 400ish. Alk of 9 is fine.

[Slyguy00]

I keep my alk at 9-10, ca at 450 and mag at 1400. Don't think those are your problems though. Id be testing phosphates and nitrates asap.

[reefwars]

Also check for aefw if you haven't yet may not be root cause but one of many

[jason604]

My phosphate an nitrate always shows 0 but I'm pretty sure it's there ur to all my long hair algae and tons of Ditris I hVe on my rocks n bottom of sump. Phosphate I use salifert and nitrate is seachem. My sea hair I got last week back split and died today. I had a fish die last week I'm not sure it if was natural cause or not cuz all my other fishes r rly healthy. My shrimps n crabs ate the dead fish n by the time I notice there was only the head spine and tail fin left. I'm goin to do another 40g water change tomorrow.

[jason604]

Originally Posted by reefwars

Also check for aefw if you haven't yet may not be root cause but one of many

What do they look like

[Slyguy00]

very very hard to see. tiny little flat worms on your acros. I think that is unlikely though.

[Skim]

Coral was colourful and started to turn brown, most of the time it mean's Phosphate and build up of Organics.

This is what I would do. Pull any GFO and GAC and go get some Seachem Purigen and couple of the Seachem " The Bag " put it your sump or better would be Canister or a AquaClear Hang on. This stuff removes Organics quickly and you should see things get better and your Phosphates should drop also.
The other thing is make sure your skimmer is working at 100% clean the neck and make sure there is no blockage of the Air supply.
Do not dose or add any 2 part solution if that's what you use for now as it also adds Trace Elements that could feed the Algae.
Good Luck!

Mike

[gregzz4]

What have you done/changed over the last 2 or 3 months ?

I know with my tank I've run into problems that caused some hair algae.
From there, my corals started to suffer as I didn't address my higher-than-normal PO4 and I not only got some browning corals, but I also ended up with a fully blown out GHA issue. It was everywhere and out of control

I lost a couple SPS during the battle. Some due to GHA, and some due to my over-zealous hydrogen peroxide dosing ... my whole tank went into shock after I decided to kill every last living spot of GHA I could see.
It worked for a couple weeks, and my corals are coming back, but I'd not do it again so aggressively

I ended up doing a lot of small carbon changes to try to remove whatever happened to my tank as I still have no idea what happened.
Near as I can tell I killed a bunch of bacteria ..
Regardless, if your corals are upset, carbon is your friend

My softies survived all this just fine, as they will mostly do

Hi PO4 can upset SPS, and so can fluctuations in salinity and Alk

As Brad stated, your Ca is a bit low, and IMHO your Alk could be a tad higher.
I like to try my best to hit 7-8 Alk, 410-420 Ca and 1350 Mag

Keeping your Alk just a tad higher (7.5) gives you the wiggle room if your corals start to use more. Keeping it @ 7 is OK, but if they use more than normal, it can dip too low before you know it

The best thing you can do is keep it stable for now and, as I'm doing, ride it out and see if things turn around

Good luck dude