I used to have an ato made by XP Aqua that they discontinued, the pump went out so I switched to JBJ ATO. biggest mistake. I am continually cleaning and trying to get this JBJ ato to not overfill my tank. while it keeps overfilling and I am just done with it. what is recommended for ATO. I was looking at the tunze but not sure if I want to go back to float valves. I'm looking at the xp aqua duetto dual, the Prism Auto Top Off - ReefBreeders, Exo Auto Top Off - ReefBreeders .