Thanks! The 55 is a low tech right now with a T5NO strip. I was going to use a 24" T5HO fixture I have. It will extend out and fit the 36" tank. I won't be doing anything crazy high light, right now it's just Amazon Swords & Java Fern, but I have some HC I might add along with getting some other medium light easy plants (Vals, Sag, maybe some moss, etc.). If I do this I'll go ahead and lay down the cash for a real CO2 system.