Thank you for the replies, I apologize for not getting back sooner. I've completed a design for construction this weekend. badflash - the filter includes a sump pump that I purchased, hope that doesn't disqualify the effort from the DIY status. Also, full disclosure, I used seedling Styros to make Styrofoam, thought about starting from seed but didn't have time to make the plant lights We'll see how this contraption works.

Jim