Ok im in a dilemma, I decided not to do the two pump idea for a refugium. I still dont have room for a HOB or gravity fed refugium. That leaves me with one option and thats to have an external overflow box running gravity to the refugium and a pump to return water to the display. My question to you Solana owners like me is if that pump fails it seems like the overflow would continue to put water into the refugium b/c the main pump would still keep the water level in the display at the level of the overflow box. My LFS says no because the water level in the display would drop however they don't seem to understand that it wouldn't if the main pump was still operational. I am speaking as though the refugium pump broke not as if there was a power outage that I understand would lower the water level in the display. Any help would be great, pics would be better.
BTW "Spanky" that is a carpenter's flasher wrasse