I'm starting to lose some fish.Two or three a day. Mainly smallies that were stocked last fall at 4 in. and are now 9-10 in.and fat. Water temp is 86* at the surface and at the bottom. 1.75 ac with 3 diffusers from Ted. Feeding twice a day-aquamax 500. Populations of FH & GSH are very strong-literally in the millions. BG & RES look great at 8+ in.and smaller,with only moderate numbers. Water clarity is about 18-20 in. with greenish tint.Could this be summertime stress? They are currently not being fished at all.About 2 weeks ago they were caught rather easily/then shut off. Very little surface activity except at feeders. Any help would be appreciated.