Refugium not working... should I create a DIY ATS

[Saltyreef]

Yea 150w is quite a lot for chaeto without a heavy nutrient load.
I used to use a 6w jbj nano glo fuge light in my biocube and it kept the chaeto growing and green. Would pull a baseball to softball amount out each week.
Sometimes it would be white right up against the glass where it was exposed to light the most.

 

[Pistondog]

I don’t have the light submerged. When I first started I had it about 1” from surface and chaeto was growing super well and then everything went downhill when I got dinos. Tried new batch and raised light to about 6” because it looked like only top was dying but now it’s just a crap shoot.

here’s what I have:
COB LED Grow Light 150w Grow Lights for Indoor Plants Kolem Full Spectrum Plant Lights, Waterproof Grow Panel Light, Veg, Seedling for Plants Tent, Greenhouse, Garden, Hydroponic

That light works awesome for me, mounted close to water with chaeto raised for max par