I have had my tank fallow since January because of velvet and I have had an hard time with quarantining my new fish ich and infections prolonging me getting them back in the main tank ive been leaving it long periods of time inbetween feeding the clean up crew I had a real bad grain hair algae and bryopsis problem I used rx to clear it up it took a few doses more then it suggested ive noticed my ammonia has gone up to 5 im worried its crashed and dont know what the outcome is going to be or what to do I did notice my nitrates drop fast and started to feed more but forgot all about it with been at my qt a lot of tge time could someone help me out