I have an ATO on there already, but it's an old airtube style float switch AT-1 tsunami so I'm worried about reliability. I was looking at a tunze osmolator because I like the idea of a sensor with a float switch back up, but since I was going to have an extra pump on the ghl I was going to look at maybe trying the ATO function with one of the extra pump heads.
I also like the idea of adding the topoff water in smaller increments over a longer period of time. I feel like my current setup dumps a whole bunch of freshwater in at once. I know I can get a smaller pump to transfer water slower, but again, since I'll have the ghl with the extra pump heads anyways, I figured I'd at least look into that.