sylvia said:
Either way - I'd take him out - 10" fish that eat other fish are not good for communities.
You do realise how badly named these fish are right? They aren't even chinese and they aren't algae eaters. Deffinately replace him with something more suitable - as I said earlier, otos are great for small tanks.
I know this is fighting a fight that cant be won by the side I'm on because there's so much bad about them already, but hey =)
I honestly do not believe they're as bad as people say they are. Personally I have 6 of them, only 1 of them has turned 'bad' the other 5 havent. Also, they DO eat algae when they're young, I've never had any algae problems and when it started to come up they'd get rid of it. When getting older, they still eat algae but just less. Mine Love cucumber =) Also those that do attack other fish are known to (just like all (repeat the All again) other suckermouths can do) attack flat boddied fish, and you dont get much less flat bodied than a puffer.
I'm not saying you should keep him, seeing as there is a risk, and I do think the tank is too small for his/her adult size. All I'm trying to say is that they're really not all that bad, and there Are people around who have positive experiences with them as well. And please do not forgot its not only the chinese algae eater that can start feeding on slime coating, its all suckermouths, its just a risk you take, that with CAEs is a bit bigger
End Rant!

Once again, not trying to cause arguements here, not making a fight of it, just giving my opinion =)
--Edit--
Sylvia, please do not see this as an attack on you, I only quoted you because of the 'non algae eating part' I didnt agree on! You're one of the members I respect most on this forum, so wouldnt want you to get upset because of this