Thank you for the welcome, I do know that some plecos get huge (I have several large ones in my bigger tanks!). I had been thinking about a clown or BN. I have always had trouble with keeping the ottos. I have tried putting them in a tank on their own and I have tried putting them in well established tanks. I have always kept them in groups, and I always lose them
. I haven't tried to keep them in a while, so it might be time to try again.