Thanks for replying,fat meloe! wrote: ↑19 Sep 2017, 19:32I am not experienced with plecos, but judging from your tank pic I think that even with a dark bottom plecos would highly appreciate sleeping shelters which are more deep and enclosed. It could make the fishes less stressed and thus healthier.
Of course, redecorating the tank when fish are still unhealthy would terrify fish and probably cause additional problems.
I will paint the outside of the bottom dark when I can.