So far the only tankmate I have set in stone will be a ray of some sort (I miss my other one and want to replace him). I will probably not do an eel as the wife thinks they look too much like snakes (but the iguannas don't bother her, go figure) and I have to keep her happy with spending the money I need to to get this large of a tank. I want it to be a fairly aggressive tank so I am researching triggers, lions, and puffers. So far it looks bleak as to adding any of those. I think a few tangs will definately make it in there. I like chevron and achilles, maybe a school of yellows. Probably a few different wrasses to help with cleanup. I haven't really had a chance to research the compatability and functionality of all of these as I am trying to concentrate on the hardware for now. I will definately be posting a thread when I start construction. I'd love any feedback from members with large tanks as well to keep the build as smooth a process as possible.