No not Puffers in my 45g, I want a NEW TANK.with common sump with EXISTING TANK. new tank would more than likely be 120+g

seems like to much hassle for the keeping it seperate, if they were side by side it would be a different story, way easier and could have bigger sump too( run the whole length of both tanks. but i would do this considering the hassle , and not much benefit to it other than one sump, which doesnt really seem like a bonus if you think about it, because one sump means one system, which means one tank goes down so does the other( as in toxins or anything that you might get)

Ya true. The present one is a 45g corner tank, and I will NEVER do another corner SW tank. Just no room underneithe for anything of substance. Put a sump, skimmer, now adding 2 Phos reactors. Damn. it soo cramped have to pull head out to change mind...

so youve changed your mind good, i think to much hassle just get to sump, you'll have to do 2 seperate water changes but it will be worth it. exceptially if one is FOWLR and the other a reef. less expensive equipment needed.

No, havnt changed mind, and neither are Fowlr any more. Ive succumbed to the coral LOL.