I'm also a cement block expert so lots of rebar and blocks and concrete, epoxy , fiber glass and foam board, basically a indoor pool, and of course a boatload of plants, with 2 = 4ft x 8ft 1 1/2 acrylic viewing windows , lot's of waterfalls, I actually have rock laying expirence, masonry exp. Am excited for the building of it, basically the 4,000 gallon was a test run, in the tank now I have around 120 SQ ft of plants, this is more than enough to keep the tank nitrate and nitrile and ammonia at bay , so I can't stress enough, plants rule,