I'll have my reef frag for sale in about a month (2 months max) if interested.
20x18x7" tall (or similar, need to measure). Its an AIO but I drilled the filter and put 3 bulkheads and ran a large sump on it. Easy patch or keep it to maximize on filtration. It's on a biocube 29 stand which would be free with purchase.
I just got a 55gl and the setup needs a lot of love...