what to put in a 210 gal?

[Rallysman]

What about my suggestion?

Crays will either nip the disk of the ray or get munched by it
Be careful with plecos and rays as well, they have been known to suck on the ray.

 

[BeelzeBob]

get a water chiller and some trout from your local brook or a hatchery

mimic a stream man. that'd be tight


oo oo
or a camen (spelling) ya know those little crocs that get like 3 feet long.

or plant the hell out of it and, get a black piranah.

you should get like some sort of monster fish, so you can throw idiots in there.