Have you tried no-pox?
What's your tank maintenance schedule like.
I would dose 1/2 the suggested amount of no-pox once you get the tank cycle.
I will never run a tank without Nopox.
I am reconsidering the need for a refugium.
No pox is so affective. It’s $25 a bottle but you won’t have any phosphate or nitrates in your tank.
Just start slow and adjust your tank as needed.