What are your paramete5s? How often do you do water changes? Do you run GFO or anything else? Do you have a sump? What salt do you use and do you add anything to it? How many power heads, if you don't have enough water movement things settle out and rot? What is your Skimmer or do you have one? I think these are all questions that will need to be answered. As mentioned above good husbandry goes a long way but depending on what kind of ha it is will make a diference.
Also when you got the rock did you curew it or was it already cycled and did it have ha then? Good luck it can be a long battle.
I do water 10% water changes regularly about every 3 weeks, but i just started to use a new salt called Tropic Marin and it tells me to do water changes every week to get the salt to work. This salt is used so i don't have to add any chemicals because it has the 70 natural elements from the ocean, but i still add my B-Ionics until the salt starts to work.. The parameters are fine though, everything is normal. I do not run GFO or Carbon though. I do have a sump but it is just a 20g tank with no modifications. I do want a better sump though, I want one that is bigger and has baffles and bubble traps. I don't know if i have enough flow though. I only have 1 Koralia pump in the tank right know for flow, but i have two Rio 2100 in the sump for my returns. My skimmers pump recently broke so im out of a skimmer for now. When I got this rock, it was well established and i didn't do anything to it because it really cycled my tank quick. There was a little tiny patch of hair algae on the rock when i got it, and i tried to get rid of it, but no luck. The algae has gone out of control.
Honestly I don't think there's many critters in this hobby that can knock down a large HA issue.Maybe a sea hare.
I would just go directly to running a GFO reactor.
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