+1 for a 125. Probably bigger. A lot of people say that a pair of oscars alone need a 125. 2 plecos in that size tank will fight.
About 17" maximum, but usually more like 13-15".Capt Dave;4538709; said:i seem to find a lot of conflicting info on the royal pleco. How big can they get in an aquarium? L190 red eye royal?
It's actually 2 O's and 2 plecos, so they would need at the very least 125 gallons.livebearerfreak;4539075; said:IMO a 110 will be fine for 2 oscars and a pleco.