HELP! Culerpa growing but cheato dying

jbow50

New Member
Hi all, I've been in the hobby now for about 6 months. I have a 75 gallon dt with a 25 gallon sump and 20 gallon display refugium. My nitrates have tested 0 since day one. I feed my 3 tangs to the point they are about to bust. My 2 clowns are fed daily. And my orange spot goby eats pods and tang poop plus shrimp and silversides i feed twice a week at night when the lights are cut off to feed coral. My question is why would my culerpa grow (slowly mind you) and my cheato die. I feel like with all the feeding it would grow well. Is this normal? Softies lps sps are all doing great besides a hammer but i dont think thats related or i could be wrong.
Ph 8.3
Nitrite and ammonia 0
Cal 420
Mag 1400
Salinity 1.025

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