climbing perch

I have a 9/10” “dwarf” goonch catfish I’ve had for around 8/9 months now with no issues but have opened the tank this evening to find he has a strange hole like injury to his torso he seems fine in himself but am unsure as to whether it’s a bite injury from a tank mate or something else does...

I use to see these all the time I cant find them! ALso looking for any killifish or sun fish that do well in natural ponds? Brampton ontario here.

Hey im wondering if its okay to house a adult ctenopoma for life in a 30cm high tank. I was thinking about searching for a better home but now that he is in the tank im starting to rethink it. So most of the day he spent in this little wooden house. Its about 12cm high and he doesnt really fit...