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I had some issues with ballests...they used Workhorse ballests which are very good generally speaking. He replaced the first one and second time Workhorse replaced it. They have always been very nice to me. My fixture runs great.
Refractometer is must so that is good.
Other tests are important PH Nitrate and Alk, eventually calcium and Mag.
But all that said your corals right now are not super sensitive ones. They won't care so much about calcium for instance.
I have found that it is good to do water changes for couple reasons.
First you can siphon off the poop on the bottom, keeping your organics from building up.
Second dilution of what is in the water.
Third you eliminate some of the organisms you are looking to kill.
Make sure you don't move the...
If it is marine velvet I don't know if hyposalinity will work. It works for ick and that is what I do for all my fish in QT. For those two small fish even a 10G will work, PVC adds some hiding places with an easy to clean bonus. Run bare bottom, do daily water changes, and I would speak to Dr...
I could break down the minimum tank sizes for each tangs but 75G would be good minimum for the smallest tangs (kole being one of them).
NikkiT and mnat are pretty darn good with nano tanks so check out their threads...though they are moved up to a 57, they are keeping it in a nano type build.
If what Darren says is true then it is best to follow his advice. I am in the same boat as mnat.....I get censored sometimes. But a kole tang is too big for that tank. Even small they are swimmers who should have more room.
Man what a bummer Bax. Sorry to hear your problems and your losses.
Everyone of us should pay attention to what you are saying though that is for sure.
It is easier to stay clean of problems then fix them.
Ever wonder why I gave certain ones away? ;D Think it is a good plan not sure how much you really have to worry about most of those fish. I suppose if you know a particular fish is territorial then keep him for last.