What would cause slow growth, and even STN on acro, if all my other corals are fine?

[braaap]

What is your potassium at? You say you are doing ICPs. Let’s see the latest one. I’d bet your flow might be low. But I think you’d really see a change with iodine and potassium.

 

[Reef Puncher]

I personally started feeding my corals amino acids and reef chili and reef roids. Anecdotally, it seems to have accelerated growth. Maybe I am just buying the sales pitch? It makes sense to me from a biology standpoint. Definitely remove the Xenia. Carbon seems to help my tank also by reducing coral warfare chemistry. The problem you have is that it takes quite some time to see a change in SPS growth. You can tweak flow. You can tweak lighting. You can tweak tank chemistry. You are not going to notice any difference for quite some time. In the end, I can almost never tell what really made the difference. As you know, water changes, flow and light are all critical, but every tank is different. I have been successful in the past by putting 2-3 frags at different heights in the tank and see what thrives and what does not. I then try to rescue the underperforming frags. Best of luck…

yea i dose AB+ and reef roids. out of curiosity whats wrong with xenia?

 

[Stevorino]

yea i dose AB+ and reef roids. out of curiosity whats wrong with xenia?

Xenia is like the kudzu of reef tanks.... at first it looks good, and then a couple months later it's spread all over your reef tank and there's not an easy solution to rid of it at that point.

 

[bubbgee]

Flow could be the reason. I have had the same issue in my tank (cube=hard to get flow right) I added another power head and stuff is starting to look better already.

This.

Cubes are so hard to manage flow on from my experience. The best way I've done this is a Nero 3 on each side and pulse alternately. I used torches in the middle bottom of the tank to see how the flow looks like and it should sway sideways if the flow is right.