I agree, I run the rio nano and it workes well.. I am obsessed with skimming, so we wont go there, but it is enough. I mess with the skimmer often, so every now and then it doesnt work (because it takes a while to get going again)... I used the carbon filter whiloe I was breaking the tank in and all the ammonia was high and nitrites, and then it got firty and I threw it out and never replaced it.
I ran an 8 gal for years with a very similar set up... it works so long as you have proper live rock, as mentioned before.
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