I suppose different people have different experiences. Here's mine: I bought a 36"-48" Marineland "Reef Capable" LED lamp with timer to go on my 40B tank (36" wide). I kept it on the tank for a few months, and I never got the first bit of coralline algae to grow on my reef saver rocks. The live rocks I put in the tank to seed the new rock were bleach white within a couple of weeks. I finally removed it when algae started growing out of control. I ran both the white and blue LEDS during the 12 hour daylight photoperiod, and I can assure you, the light was very intense... almost painfully intense. I also bought an LED refugium lamp in 6500K, which was supposed to be ideal for macro algae. I watched ball after ball of cheato disintegrate into oblivion. I replaced the light on the tank with a four-bulb T5, and the light on the fuge with a 23W spiral fluorescent "daylight" bulb in a reflector lamp. It was no time until I couldn't see through the sides of my fuge for all the coralline algae and chaeto grows like crazy, and I'm constantly scraping it off the glass in my 40B... which has softies, LPS, and SPS in it now. Just my experience...I have a differentopinion - not thatI'm right but my experience differs.
I've seen the zooxantellae population adapt to just about any visible light spectrum and I've even seen some adapt to UVA light (but that wasn't 100% successful). In my opinion a 10K a Actinic would be just fine providing the intensty is sufficient.
I've gone through 5 firefish... three initial firefish, suddenly down to 1. Bought 2 more, suddenly down to 1. Looks like 1 is the magic number for firefish in my tank. Firefish, like most all dartfish, are jumpers... and they manage to find the tiniest openings to get through. On the brighter side, the one you have remaining will probably still be there years from now...Thanks I appreciate the Intel. I think I'm out of the game until after January... Just too much to figure out and too expensive.... I will run the light I have, enjoy my fish and look into it next year. I actually LOST a fish this week. Bought two firefish, two hour drip acclimation, all was good, now I can't find one of them. It's been three days, wife moved all the Rick, cover has been on the tank. It is like 90% covered. No sign of one of the firefish. Hard to succeed in this hobby.