PE does give an indication if the frag is in growing mode. If there isn’t any PE, making sure parameters, light and flow are OK. If all is OK and still no PE then it’s probably a system maturity issue. I almost gave up on Acropora at the 1.5 year mark as I couldn’t get them to grow while all other SPS were ok. For some Acropora I bought the same frag type 3 times before it finally survived and grew. Expect frustration and loss.
I’ve had an alternate experience from many as I see this “a tank needs to be matured for over a year for Acropora” talk a lot.
I have had Acropora success in the past so I’m sure my experience has helped.
While my new tank hasn’t been perfect by any means, at a little over 4 months in I haven’t lost a single Acropora (loudly knocking on wood here). I’ve even had one new frag bleach (probably due to overzealous dipping) and it came back around to full color with new growth now. Will update when/if I run into frustration/loss. I’ve already popped a $300 acro frag in my young tank and it seems to be doing great (darn impulsivity). If everything crashes and burns well… you can say I told you so
I’m just not satisfied with the expectation of struggles for over a year. I’m over here with PE and growth and telling the corals to hurry up and grow. Constantly trying to think of ways to speed them up. At the same time not changing anything fast since I’m at a good baseline now.
Hang in there, but my suggestion is if you aren’t having success there is either an issue with your system in some way or you’re getting inferior stock that’s ready to let go when you get it.
Grow sticks grow!