I had the same problem when I set my reactor up, because of the water level in my sump there was an inch or two of the rock exposed to air when the pump was off (
I had it 3hours on 3 hours off) What I did was decide to trottle it back a bit and run it 24/7. The pump on my rector is rated at 200gph and zeo says max 100GPH so I moved the ball valve to the 50% position and then turned the valve to about 50% of that.. just really a trickle going through right now but the results speak for themselves.
I've been dosing .5ml zeostart in the morning and night and 4 drops of zeofood7 and zeobak in the sump beside the reactor pump at night. I clean the zeolites with 15 strokes morning and night. I am also dosing 4 drops of sponge power and amino acid direct in the display ever night and I'm dosing 2ml of coral snow in the display every second morning (it makes the water cloudy for about two hours so I decided to do it in the monring before I go to work so it is clear when I get home)
I'm no expert on zeo at all but it you have any questions on the dosing let me know
