I am running a 3 tank setup with Aqua Bridges between all 3 tanks 60 G Hex, 55 G and 75 G. I have a total of 40 fish in the setup 8 of those are Poly's.
If you are interested in seeing the build here is the link.
http://www.monsterfishkeepers.com/f...39-Aqua-Bridge-Tank-Setup-Upgrade-(1-Viewing)
My Poly's do explore the tanks on occasion but always end up back in the 60 G Hex tank. out of the 8, 7 Poly's hide and roam the 60 G all day. The one odd ball that isn't in the 60 G is one of my Endli's, he is hanging with the Cichlids in the 55 G.
My biggest is my Delhezi at 10" and my smallest is my newest Ornate at 4.5".
I had an issue prior to this group of 8 Poly's. I had an Ornate about 7" and a Sene about 4" well I fed them and went to bed and in the Morning I woke up to a dead Del and the Sene stuck in his mouth dead also. The Del couldn't choke down the Sene and ended up committing fishicide.