I dose ammonia to feed my corals(SPS). Been doing it for months with no ill effects. Aquarium has a nice bioload(fish) but cronic low nitrate(0 PPM) even though fish are well fed and no algae in tank. Figured when I read about dosing ammonia what's the worse that could happen-- dead coral-- which is what was happening due to no nitrates--again even with a good bioload of well feed fish. I was dosing quite a bit of nitrate a week( to maintain at least 2.5 PPM of nitrate) but if I didn't dose nitrate it would zero out. Decide to try dosing ammonia, bought some Dr.Tim's and I think to cycle a tank it calls for 4 drops per gallon. I dose 1 drop per 10 gallons everyday. I'm no longer dosing nitrates and my tank nitrate stays stead at 2.5 PPM.