10 Percent solution of Lemon Joy dish soap works great. Spray a little right on top of the cube. Will come back eventually but takes care of it safely and chemical free. Stops it from working its way through the cube
You've got a beautiful setup dude. It is unfortunate and not understandable y people have not shown more interest in this thread. Just wanted to say I'm loving it tho. Sucks it takes 3+ month 12/12, suprised with all that you've got going on you didn't go hydro. Any particular reason?