I had a 3' greater siren years ago in a 55gal and was thinking maybe one would make a cool tankmate for my aro. Think they'd get along ok? It's hard to find fish that won't tear up my plants or get eaten. I had a 7" bristlenose disapear so I have to be careful. Most big fish come into the LFS as trade-ins, and not very often. Though maybe a sire would be safe, and cheap enough if he were to get bitten in half...