It could be them. I've noticed a lot of floating vegetation in ponds with TGC where there is plenty of plants for them to eat, I guess if a piece slips out of their mouth they just grab another instead of chasing it down.

Get yourself a cheap swimming pool thermometer.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).