My current tank is a free 29 gallon top fin tempered glass mediocre tank, an upgrade from a 20 gallon free top fin. SO my tank is undrillable, at least according to top fin, and its full of life anyhow, i was wondering if i could fashion an overflow by drilling holes into a hang on the back type penguin filter and plumbing that to a small refugium its main purpose being to hide unsightly equipment. Anybody tried this? any info would be helpful.