A little more history would help....
What type of equipment?
How long have you had the tank running?
How long have you had the fish?
Any recent changes?
Do you or anyone in the household spray to kill insects? The dead or dying insect can fall in the tank and the fish could eat it.
Any other info could help.
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125 gal (473 liter): Low Tech (1.5wpg PC for 10 hours, no CO2/ferts, gravel substrate), Equipment (72" Coralife PC, Eheim Pro II 2128 w/built in heater, FilStar XP3 w/Hydor ETH201 inline heater), Fish (6*Discus, 2*Angel, 5*Clown loaches, 4*L-018 Gold Nugget pleco, 1*L-260 Queen Arabesque pleco, 7*Cories, Farlowella cat)
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