How big do Clowns really get?

I've always avoided getting Clown Loaches, as I've only got a 55 gallon for
my Tropical tank. I'll be upgrading to a 90 gallon soon, so I thought I
would add some Clowns to the group.

Current inhabitants a

4 Tiger Barbs
4 Rosy Barbs
2 SAES
3 Yoyo Loaches
Unknown Otos (Probably 5)
7 Cardinal Tetras


I'll probably add 4 more Barbs (2 Tigers and 2 Rosy) to get them back to six
each. Although they don't seem terribly distressed about their reduced
numbers (originally 6 each). I may also move some of the SAEs (3) from my
small office tank to the larger tank, although they seem quite content where
they are.

Can a 90 gallon with these inhabitants support 6 Clown Loaches? Seems it
might be overcrowded to me.