Sounds like you're going to put these Troph's to their death march.
The absolute minimum for Troph's is a 4' long tank. All of the filtration in the world isn't going to matter...it's the AREA that they need. They will get stressed out extremely easy in that small of a tank.
As for the poster who says they have years of experience with T's and gets bloat..you are doing something wrong. I, as well, have a lot of experience with T's and although I always have Metro on hand I never have battles with bloat.
Sorry to be so negative...just sounds like you are going to possibly kill a really nice, and expensive, group of beautiful fish.