i have a 20 L and its a convenient and easy to care tank..the problem is that temperatures affects it very quickly...depending were you live, i had the problem when using its regular hood that temp somtimes rised to 90f, be carefull on what ligth are you gonna use , cause it could transfer to much heat to your aquarium, and thats not good to some corals..im using coralife t5 dyligth/ actinic 36 watts..i removed the hood, leaving only the ligths with its legs stand, as same as my 10g with the oddyseas t5..now temp is 80 f and theres better gas exchange..soon ill be adding some leather corals and shrooms...if you have air conditoner that wouldnt be a prob, or a chiller..