I have a SC 150g with a modular marine overflow box, running bean animal drain set-up. Primary at full siphon, secondary with a trickle & emergency about 1/4" higher than secondary. After I get it tuned it runs fine for a few days but as water evaporates the water level changes in my overflow box. Before my ATO kicks in it starts to make noise from the waterfall effect. I have other tanks running bean animal that don't have this problem.
Why would the level fluctuate in the overlfow box after being tuned in? My other tanks are set it & forget it.
Why would the level fluctuate in the overlfow box after being tuned in? My other tanks are set it & forget it.