almost certainly bites/rasping, almost certainly the pleco, happening when the lights are off.
It will heal if you let it have the tank to itself, otherwise having no-where to run, being trapped, it will stress out
when/if the ray gets big enough it will eat the pleco and the aro.
IMO rays should be kept as single species, not community fish.
It will heal if you let it have the tank to itself, otherwise having no-where to run, being trapped, it will stress out
when/if the ray gets big enough it will eat the pleco and the aro.
IMO rays should be kept as single species, not community fish.