Definatly my pleco every arangement i make he seems to think doesnt benefit him well enough and will grab the plants he finds suitable to make his darkness cave a bit more to his liking
mine would be the lepard dinio i had( took him back) because he was an evil little bugger chasing everything i have!
also the algea eater i had( in a different tank) chased my fish n they always hid.
they were a good pair chasing my fish.
I said it in another thread, but our most annoying fish atm are our guppies. They pester every other fish in the tank and 1 of them keeps chewing part of his tail off.
The Tinfoil Barbs I used to have. I couldn't feed anyone else in the tank because they ate EVERYTHING. They are happily living with my co-worker who has a 100+ Gallon Tank and another Tinfoil Barb to keep them company.
Right now, it's probably the Pleco I have in my 55 Gallon that is soon to also be re-homed!
ottos. they love to hide and suck in the wierdest places. mine are really small right now, so the filter could be a hazard. they're never in the first places you look, like the glass, caves, gravel. instead they're inverted on the underside of a backfacing leaf, and seem to snicker at your mild panic.
mine was a guppy. he must have thought he was gods gift to all females..well and males..cause he tried to seduce anything that moved..he just about killed my other male, and i was afraid he'd kill some of my platy's he wouldn't leave alone.