Thanks guys... I have a 20 gallon with a hang on filter (aquaclear with foam and the limestone chunks), a tiny piece of live rock, and like .5cm of sand to make the tank look a bit nicer (it's in our den). I also have an air bubble wall and and a big cheesy pirate ship for the fish to hide (for the kids).
I had been doing a 25-50% water change (5-10 gallons of water from the 100 gallon tank) weekly (I do a 10% water change in the big tank weekly) and I ended up having my yellow tang and flame angel that I just bought, die. I thought I was doing something wrong. I had added prime every couple of days.
The nitrate was always less than 5, so what did I do wrong?
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