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Try those tips, then turn off all your blue/violet LEDs, and turn on the warm white ones if you have control of that easily.

Yeah no idea what it is then. Try the urchin, it might at least loosen the bits if they're not etched into the acrylic. But a better macro picture would help. Then maybe the other acrylic gurus could chime in like @Kensington Reefer

Fingernail doesn't take it off either? Hard to tell from the picture, can you take a close up macro shot with the whites only on? Only thing I had issues with in the past was a specific species of pink coralline algae. To this day the only thing that got it off was a blunted metal scraper that...

Also pretty sure they're discontinued so keep that in mind Will

I think Rich uses them

My joke is that you'd need to kill/cut it to know!

It will be blue if your water parameters are terrible too!

Eric used a saw to cut the frame and we used 90 degree attachments that it came with to make a square cut out. Kinda janky but it works. I still would want a custom polycarbonate lid in the future to block less light in the center of my tank but they're pricey.

If you want to spend and want a high quality custom sump, you should go with MRC https://www.mrcamerica.com/custom/ They have some base 48x18x18 sumps that would work for you too, if you just retrofit the drain area to an off the shelf filter roller https://www.mrcamerica.com/bio-sumps/ Other...

Whomever told you that hasn't been in the hobby long enough. We kept things long term under garbage compact fluorescent tubes back in the 90s and early 2000s. These blades can generate a lot of light, especially when in a shallow system like this. What's your water change and mineral replacement...

Halymenia stipitata

Don't cut the lid, but you can increase the violet quite a bit. I run mine closer to 90% (of course do this gradually not overnight). Can adjust red and green to your overall color tastes after.

You're probably losing 10% or so of the light to the new mesh lid also (assuming you didn't taking your light readings under the lid. Post a picture of your color settings too.

The Fiji yellow leathers will only look at way under full spectrum lighting so keep that in mind. Note that I saw these in the wild at just 3-5 feet getting insane amounts of light. Probably why they liked the old Iwasaki 6500k bulbs so much.

Don't use those old lights, they were corroding pretty bad. Try turning up the intensity of the light and if you're using the tighter spread attachment, remove that. I've seen btas grow under terrible lighting. Whether they're more inflated under weak lighting, I'm not sure but it could be...

Pictures are still helpful and feel free to post here

Locking thread

Ali is the owner there. He's part of the orange tongue coral club with me, Julian, Kenny, and Collin lol

Is this PIF or DBTC?

@HankDean V would probably know