have you had a very close look for pests?
sometimes red bugs will not kill a coral or reach plague levels but exist on the coral just enough to slow it down..
have you tried new frags?
sometimes, a coral becomes "unhappy" with instability and will refuse to grow until it knows things are safe. It's reserving its resources to deal with the next batch of crazy coming its way instead of using it to grow...
New frags may be more willing to trust that you have things under control - don't mean to anthropomorphize so much, but it's more fun that way.
+1 on tiny frags taking forever to get going. Once something has encrusted and is able to put 2-3" on with multiple branches, it should be off to the races. But the little booger sized frags you may get from other hobbyists or boutique vendors will take a year to even sprout a few branch buds and encrust over the plug. That's why I hate buying those because you have to accept that you won't see dividends for a year if all things go well.
You mention you "recently" switched to the ATI lights. How recent is recently? I made the same switch and the growth among my larger/easier SPS colonies like stylophora and montipora was dramatic and shocking. Within one month of changing, Size has increased by roughly 15-20% and PE is phenominal. I expected that. But the 1" acro frags, encrusting, but their size basically guarantees it will be slow going at first. Even if everything is perfect, small frags just grow slow. Keep Alk stable, keep a bit of NO3 and PO4 present in the water. Keep the fish fat. Keep the temp in range and stable. keep the salinity stable and in range. Keep the bulbs fresh. keep the flow high and turbulent. Things will grow. But be realistic in expectations. Take monthly pictures of each frag as well. You'll notice small changes among the first few, and by the time you notice big changes, you'll no longer care to keep up the growth documenting experiment and will be more focused on fragging
+1 on tiny frags taking forever to get going. Once something has encrusted and is able to put 2-3" on with multiple branches, it should be off to the races. But the little booger sized frags you may get from other hobbyists or boutique vendors will take a year to even sprout a few branch buds and encrust over the plug. That's why I hate buying those because you have to accept that you won't see dividends for a year if all things go well.
You mention you "recently" switched to the ATI lights. How recent is recently? I made the same switch and the growth among my larger/easier SPS colonies like stylophora and montipora was dramatic and shocking. Within one month of changing, Size has increased by roughly 15-20% and PE is phenominal. I expected that. But the 1" acro frags, encrusting, but their size basically guarantees it will be slow going at first. Even if everything is perfect, small frags just grow slow. Keep Alk stable, keep a bit of NO3 and PO4 present in the water. Keep the fish fat. Keep the temp in range and stable. keep the salinity stable and in range. Keep the bulbs fresh. keep the flow high and turbulent. Things will grow. But be realistic in expectations. Take monthly pictures of each frag as well. You'll notice small changes among the first few, and by the time you notice big changes, you'll no longer care to keep up the growth documenting experiment and will be more focused on fragging
Hydrogen sulfide in my siporax..
+1 on tiny frags taking forever to get going. Once something has encrusted and is able to put 2-3" on with multiple branches, it should be off to the races. But the little booger sized frags you may get from other hobbyists or boutique vendors will take a year to even sprout a few branch buds and encrust over the plug. That's why I hate buying those because you have to accept that you won't see dividends for a year if all things go well.
You mention you "recently" switched to the ATI lights. How recent is recently? I made the same switch and the growth among my larger/easier SPS colonies like stylophora and montipora was dramatic and shocking. Within one month of changing, Size has increased by roughly 15-20% and PE is phenominal. I expected that. But the 1" acro frags, encrusting, but their size basically guarantees it will be slow going at first. Even if everything is perfect, small frags just grow slow. Keep Alk stable, keep a bit of NO3 and PO4 present in the water. Keep the fish fat. Keep the temp in range and stable. keep the salinity stable and in range. Keep the bulbs fresh. keep the flow high and turbulent. Things will grow. But be realistic in expectations. Take monthly pictures of each frag as well. You'll notice small changes among the first few, and by the time you notice big changes, you'll no longer care to keep up the growth documenting experiment and will be more focused on fragging