Ok so 3 days ago I noticed that my foxface angelfish went missing... Looked everywhere inside and outside the tank still nowhere to be found... So I check levels and my nitrates spiked to between 40-80ppm.... Last night did a 15 gal
water change (I have 60 gal
tank) and all fish seemed fine ... This Morning I woke up checked nitrates and they are still high and now I have a missing emperor angelfish the top of tank is covered so there is no way any can get out even looked throughout top of filter don't see anything.... Someone please help me I am going insane don't know where they would be disappearing to .... HELP PLEASE!!!!