When I first started I figured, a 29G Biocube would be easy since its an "ALL-In-One" package. And yeah, it was fairly easy and simple. So I took an empty 38G I had in the garage and turned that into a SW reef. Well I can't say that the 29G was any easier than my 38G. 38G was easier in some aspects because I could put a hang on overflow on it, and I have a 10G sump. Long story short, I like my 29G Biocube (that's still up and running) but if I had to do it again, I'd have just found a nice sized tank and stand on Craigslist and skipped over the biocube. Best of luck, its a fun, but very addictive hobby.