how hard is it to make a DIY bottom drain? I mean I picture a 3" bulkhead along the bottom and an upside down plastic plate or platter from Walmart with a PVC frame under it to hold it at just the right height. little bit of epoxy glue and you're done....why wouldn't this work? Cost would be like $20 for the bulkhead and parts less then $5. Thats 1/2 the price of the tetra 3" bottom drain.