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Electric lemonade and Jason fox tnt...I also have golden rod that is growing out and should be ready to frag fairly soon. Electric Lemonade is 10 a frag and tnt is 20.
It doesn't look like its going to be a great light for dedicated. They look to be better as a replacement/competition for t5s and or Reefbrites.
This is what you really want to do honestly.
This is from AIs site showing a single 21" version on full 100% so its not putting out massive...
I assume you mean the umbrella effect on them. It happens to them sometimes and I don't really think there is an explanation to it. They will switch back to normal eventually.
I had two in my 20g for bubble algae. One was a model citizen, until all of its legs were ripped off by the other one. I also caught the "bad" one eating a bubble tip. Needless to say he has been sumped and I still have a emerald crab with no legs pulling itself around my tank lol.