I know you're looking for a cube, but... I have a 40 breeder, drilled, (3) overflows, (1) return. The tank size is 36 wide by 18 deep by 17" tall... standard 40 breeder. I just emptied it yesterday. Comes with rough cedar siding stand and hood I made, DIY 48 cree LED in hood, 4 drivers, (with plexiglass cover), coralife skimmer, rio 1700 return, tank is drilled, was running yesterday, drained yesterday. 29 gallon sump with skimmer area, return area, and fuge area. 2 buckets of sand, 1 bucket of rock. Rocks may still have corals on them, xenia, zoos, leathers, mushrooms, etc. None of it is clean, still wet, fire sale price, clean yourself, $250. LED fixture parts alone was over $500. LMK if interested. Sand and rock is in buckets less than 24 hours right now, still wet. Comes with top off storage container that matches the stand to hold 5 gallon bucket. Manual top off. I grew sps in this tank under this fixture no problem. Ready to fill with water and plug in.
$250 cash. pick up only.