Yep, kinda. I feel it’s a deficiency combined with led sunburn. A lot of my cultivars are displaying this trait so I would say it’s not genetic. Forever trying to dial in the 2 part Mega Crop and light intensity.
Yep. Just an old school bubbler. I size the holes to accept 1" rockcubes and use that as collars. The cubes don’t touch the water. Here’s a recent post.