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How long has your alkalinity been that high? I've found nems don't really like it that high
I guess that doesn't help you out a whole lot since it seems you're probably newer to the hobby so aren't really sure what you need and all of the advertising said that was a good light.
Assuming you have a standard 29G tank, 30Lx12Dx18H the cheapest light you would get away with if you're dead set on having nems but are clearly on a budget would be the Black Box style LEDs BRS just did a video on:
Personally I would throw a few more $$$ at it and upgrade to a safer and more well known black box in the $150 range and get a Superlux from Reefbreeders or whatever the comparable light is from SB Lights. Hang it 16 inches above your tank for decent spread, start with your blues at 35 and your whites at 15 and work your way up from there. Ideally you want to keep BTAs somewhere in the 200 +/- 50 PAR range. Sadly PAR and spectrum are not the same thing and even if your light was capable of producing even the bare minimum 150ish PAR the spectrum is complete trash for Nems.
Hope that helps a little bit, but I don't think your Nems are struggling because of not enough light, I think they're struggling because of not enough of the right kind of light. You would honestly be better off with multiple PAR38 bulbs hanging on your tank then that light.
Yes I'm aware of their par numbers, that is with both channels maxed at 100% and a majority of that would be coming from the whites which you are barely running. If you had a PAR meter you would see for yourself that your Nems are probably getting something like 50PAR if you're lucky depending on how deep they are under the water...
Good luck, start SLOW
I actually just read this on the R2R article section and came back to post it for you:
https://www.reef2reef.com/ams/the-s...k-lighting-a-semi-scientific-documentary.368/
Is that the right link?
and the result seem it would be OK under T5.Doesnt seem like a lighting issue at all. I kept nems under Chinese black boxes without issue. Nems, just like almost everything in this hobby can be temperamental. With that being said it will generally take a day or two for the nem to find itself a new place to call home and boom, he's back to normal I'm willing to bet

