Interesting, but I suspect it is something other than LED vs t5. It may contribute as in LED potentially have more energy.
I had this odd growth for about 1.5 years.
Odd growth pattern:
Now:
Another coral odd growth pattern:
New shoots now:
I still use the same LED.
One of the things I changed was trace elements. What I noticed is that when I had deformation growing my Fe/iron was detectable by ICP.
That was odd because Fe should precipitate quite fast.
When corals are growing ok Fe is dosed but ICP states not detectable. The new trace mix adds lot less Fe.
I think part of this is trace element related, perhaps too much of some trace elements leads to coral obesity…
Trace element are in food and we may be adding too much.
Just my thoughts.