Most of the fish you have like hiding places, if I were you I would try to move all the wood to the back of the tank or keep the top half of the tank open for the fish to swim, you catfish eventually will like some more open space though so I would take some of the wood outMy tank is quite full with wood. Its perfect because I have a lot of fish and hiding spots are nice so they dont attack each other.
But when my fish grow full size, do u guys think its better to remove the wood so they have more swimming space?
the stocking right now is:
1 serubim lima
2 bullhead catfish
1 pikecichlid (I dont know what type it is, but its a smaller species)
1 hypostomus plecostomus
2 gold eels / Erpetoichthys calabaricus
1 ctenopoma aucistrus
1 mastec. dayi
1 polypterus orni.