How are you determining what the set gph value is? Does it account for head loss?
Anyway, mine (Reefer 250) works a little better with the level set to just overflowing the emergency a tiny amount. I use my apex to adjust the % on my varios-6. I use the included gate valve to set the general amount of flow I want and use Apex to tweak the level...much easier IMO. I have it set to 42%, but I have no idea what the flow rate is. I can also set the pump to just maintain the head without inflow or outflow which is great for feeding time, minimizing gurgling.
Definitely not accounting for head loss. I'm taking the max gph (1050) and dividing by 5 (the number of power settings the controller has), and multiplying by which setting I have it on, which is 2. So I guess it's more like 420gph. The recommended flow rate from Red Sea is 530gph, so I'm guessing that number doesn't factor head loss either. It's really all a guess. Think I should bump it to power level 3 safely?
That's interesting, so you do overflow into the emergency too!
I don't have a breakout box, but but maybe I should get one for my Apex Jr. so that I can do a bit more fine tuning.
Thank you!