Recently turned my 72 gallon into a discus tank.
6 juvies, between 2.5" and 3.5". Knew about the sensitivity issues due to size, felt up to the challenge as I have been keeping fish for years, including breeding three species of ACF, axolotls, and angelfish.
Other stocking includes 6 threadfin rainbows (was 7, one jumped out of the net during substrate change and was found too late), 6 sparkling gouramis and 1 german blue ram.
The other day I made the move to change my black sand to play sand. That is when the trouble began.
Yesterday, a day after the change, one of my 2.5" discus died, readings were Ammonia 0, Nitrite 0, Nitrate between 0 and 5. The tank had received a 100% waterchange during the substrate change. The tank had been getting multiple water changes weekly since the discus had been added anyways.
This morning my GBR is sitting on the sand, breathing alternating between fast, labored and slowing.
Tested the water and was between 0.5 -1.00 Ammonia, 0 Nitrite 0 Nitrate.
I did a large water change.
I am panicking. I fear that yesterday when I filled up the tank from the tap and treated with Stress Coat that I did not give the Stress Coat ample time to spread and may have turned the filters on too soon, sucking up non treated water. Could I have wiped out my entire filters?
Panicking is probably putting it mildly. I am full out freaking.