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The Elos tanks are really sweet, but not exactly the same as all in one.
Not sure why you are wanting to downgrade(I upgraded and it is a whole different ballgame) I could see using my nano again for say a species tank but as a reef tank not really. Have you had a nano before and want to go back?
Maybe if you can answer the usual questions about stocking, size requirements, ect you can get more input from others.
I have a JBJ 28 Gal
I went from a almost 600 gal system and now 28Gal ;D
Easy to take care of
It has a 150W HQI with two 18W PCs
I am not running a Skimmer I just change out a few Gallons of water every once and awhile
For fish I only have two clowns in there and there RBTA
I am running a Chiller because with the HQI it was running hot
I am thinking about taking out the center portion in the back (it has Carbon and a filter block in it) and make a fuge.
Oh yea one other thing I am almost saving 300 a month on my electric bill
VERY HAPPY WITH MY DECISION
Check out Nanotuners site
I also like the Redsea max tank (There is going to be one at the frag swap)