The one concern/question I would have about this setup is temps.You mentioned that it gets very warm where you are at in the summer.Stinky alluded to that in her last post.Developing benefical bacteria will be very important (IMO)but I would postulate that water temps over 90 degrees would create a ton of problems.Its a great idea though,I would really like to see how things work out for you,keep us informed.Take care and be well,most of all be safe.