Large water changes input

[waynemah]

Originally Posted by Parker

You don't necessarily want to drop your nitrates that far that fast, nothing good happens fast.

Since it's to the point where there are casualties, it might be a good idea to try and reduce the nitrates fairly quick.

I would perform a 20% water change every 2 days until the nitrates are in check. During this time look for the cause of the nitrates and look into a long term solution for the nitrates.

If you want some solutions, it might be a good idea to post some details about your setup / husbandry.

[sirruckus]

90 gallon reef tank with one corner overflow & opposite side return, (2) 950 gph powerheads. Estimate 75lbs Live rock with fine sand bed.

-estimate 30 gallon multi chamber sump with:
-Marineland Pro 300 skimmer first chamber with return line - no filter sock
-one free chamber with heater and sensors
-Sedra 7000 return pump in last chamber with nano sized powerhead to keep circulation in sump & ehiem canister filter acting as a reactor filled with the red ceramic balls, introduced this when trying to seed zeobak

P.H. around 8.2
Temprature 80.5-81.5
Magnesium 1100ppm-1300ppm

I'll get my other readings when I'm at home tonight

[Parker]

Originally Posted by waynemah

Since it's to the point where there are casualties, it might be a good idea to try and reduce the nitrates fairly quick.

I would perform a 20% water change every 2 days until the nitrates are in check. During this time look for the cause of the nitrates and look into a long term solution for the nitrates.

Agreed, I only meant for a very large water change, 80% etc.

If the fish are already stressed from the high nitrates, adding in the stress of acclimation to a very large water change isn't the best option, unless you have no choice. In which case, you do what you have too.

[Aquattro]

I would have no concerns doing a 80% water change. Just be sure it's very close to the existing water in all parameters you can measure. Temp, pH, Ca, etc..And don't use a different salt

[ocean diver]

How often do you clean your canister filter?

[sirruckus]

actually I haven't cleaned the canister filter - all sponge material etc. has been removed, only the ceramic balls are inside.

[sumpfinfishe]

IMO i would do five 20% changes every other day that would give your
setup a good flushing

[kien]

if done carefully (similar parameters as Aquattro suggested) a larger water change (50-80%) should go just fine. This is how I have done tank transfers in the past. Fill new tank 20% with old tank water then the rest with new water. As others have said, you don't want to be doing this on a frequent basis, but for a one or two off event for quick and short term correction purposes larger water changes are fine. A few weeks ago I did two consecutive 50% water changes in my tank to help flush out a treatment that I did on my tank.

[sirruckus]

I appreciate your guy's input on this topic - lots already!

I understand the worry people have with such a large water change, and I agree it should be avoided as best as possible. I can't say that I've done one, and most people probably cant (even those who advocate not to do one) - because it gets into an uncomfortable zone.

But one analogy I heard from someone that was successful:

consider yourself as the fish - trapped in a garage with a car running, filling up with exhaust (Phosphate levels) - opening up the garage door to let everyone out as fast as possible may shock you, but is going clean the air and.

simply - each has its benefit and each has its downfall.

[waynemah]

Originally Posted by sirruckus

actually I haven't cleaned the canister filter - all sponge material etc. has been removed, only the ceramic balls are inside.

The Ceramic balls might be the cause of your nitrates... If you have room in your sump, you might want to consider sourcing a zeovit reactor, use the zeo media and go on the base system (Start, Bak, Food). It's a fairly proven system and well supported.