Can this really all be nitrate related? I have had two other post "Fish Loss After API General Cure" and "Any Ideas on Cause of Death" I have done WC every 12 hours, nitrate is staying 20 to 40 but has not hit 80 again. Guppy still acting sick. Molly show no problems. Neons seem ok. Larger Cory seems ok but smaller one is very sluggish. HELP I really am trying to do everything I can to stop this loss.