You need a better filter
I personally wouldn't put a HOB in any cichlid tank, at least not as the main filtration. I have an AC70 on the 120 gal but it also has a big sump filter, so the hob is just an add-on, I mainly use it for "aquaponics" and I like the waterfall for extra surface agitation.
Also seachem purigen is great for crystal clear water among many other things, probably one of the best filter media you can acquire... and it's rechargeable.
I personally wouldn't put a HOB in any cichlid tank, at least not as the main filtration. I have an AC70 on the 120 gal but it also has a big sump filter, so the hob is just an add-on, I mainly use it for "aquaponics" and I like the waterfall for extra surface agitation.
Also seachem purigen is great for crystal clear water among many other things, probably one of the best filter media you can acquire... and it's rechargeable.