Thanks Jeremy. I looked over those models and it seemed 2 out of 3 won't fit in the sump (11 1/4" x 8 1/4')
I looked over the site and it seems these will...
Classic 110INT Protein Skimmer
Classic 160 Protein Skimmer
SRO 1000 In-Sump Protein Skimmer
And this one too, but it may be to much skimmer (thoughts?)
Regal 170SSS Protein Skimmer
I can see from the descriptions which will fit in the sump, but I am unsure how to determine if the height will be a problem. I have 27" of total height and the water in the sump comes up 13" (so 14" above the surface of the water.) How far in will each sump sit in the water and will it leave me enough room to clean to collection cup?
Any help will be so appreciated!
Steve