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Kellie, you're getting great advice so I can't really add much.
I'm in South Louisiana so I know what you're talking about with the temps in the 90's. The water temp shouldn't be that high.
If the sides of your pond are straight, you have about 2800 gallons. I don't know what kind of filter/pump set up you have but it doesn't sound sufficient for that amount of water.
Someone already said it sounds like oxygen deprivation. The algae uses up all the oxygen at night so the fish die of suffocation.
Here's the fastest, cheapest and easiest thing to do to get them more oxygen. You're going to make a spray bar. You're going to need a submersible pump that you can get at Lowe's or HD and a piece of 1/2" tubing.
Go to Lowe's or HD and get a piece of 2" pvc, a 2" pvc cap, a 1/2" nipple (it's gray and screws on one end with a beveled, graduated end on the other side to slide hose tubing over) and a pvc reducer from 2" slip to 1/2" female thread.
Put the cap on one. On the other end, slide the reducing fitting onto the pipe, screw the nipple in and put the tubing over the fitting. Drill 3/16" holes 4" apart along a straight line on the 2" pipe. Hook the pump to the tubing and position the spray bar on the side of the pond, pointing the holes at about a 45 degree angle to the surface water so you get the most splash.
I've attached some pics. If this doesn't make sense, pm me and I'll give you my phone number. I can also go take pics of the fittings if you need them. I think I have some laying around.
If there's any way you can make a TT, that will help, too.
You need to get more biological filtration going once you get them past the crisis.
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