Tony you should check Kathy's journal
and the way she has the screen around the overflow you don't have to clean it every day because if the top gets clogged the water can still find it's way under so the overflow continues to function. Even if you do yours differently it may give you a good idea how to do it without clogging up the mix, good luck.
Thanks for that, just went and checked it out. Then realised it had been awhile since I looked at that journal, and also that I didn't post about it the first time but made it a point to this time
Kathy's got a pretty awesome tank there.