Senegal Bichirs suddenly not eating.

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I would find out the parameters and fast (ammonia, nitrite, nitrate, pH and temp). Really have to start with the basics and work from there
 
All the water parameters are fine. The other two have started swimming around and poking at their food (they were never the best eaters.) The biggest and healthiest one basically doesn't move and has gill issues. I think his pectoral fins might be suffering somehow too.

Full treatment of Prazipro and antibiotics, no improvement.

I've done aggressive water changes, tripling the amount I typically do. I really doubt it's any of the chemical poisonings.

One thing that has happened is I've had some thick green algae growing on various surfaces, including the plant leaves. It comes off in sheets and my two species of snail (both established about 2 years or so) refuse to eat it. Could it be related?
 
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temps were about 79F.

It was actually bacterial. Two of the bichirs had it, the oldest one died sadly but the weakest one is chugging along. The two remaining ones killed one of the nerite snails and ate it, so they are back to normal shenanigans.
 
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