I am looking to buy a hang on the back refugium from a guy off craigslist for my 55 gal tank. I haven't seen it yet and was wondering what type of pumps are hooked up to these to get the low flow threw the fuge? From the dimensions he told me, (40 inches long, 4 inches wide and 18 inches tall.* Holds about 15-20 gallons). This is coming off of his 150gal tank. I have tried to do a search for a hob refugium with these dimensions and have not found any. He also said it has a power compact light across the whole thing??