I had a D2120 over a 30G tank for a little over a year. The far outer edges were a bit dim but the tank was 30" long, the fixture would cover a 24" tank nicely. This tank didn't house any SPS but it did have various LPS and soft corals in it. Some corals grew great and loved the light, others stayed alive but also stayed the same. A few zoa frags I had no matter where I put them just wouldn't open up under the LED but popped open at night. I had two tanks at the time and ended up shutting the 30g down in favor of just a single tank to look after. The other tank just has T5's on it and all the corals seem happy regardless of placement, I have a few SPS on the upper rock work but also have a plating monti on the bottom. I've had a Gen3 Radion, AI Sol and MH fixtures as well over the years but overall prefer T5's. I do miss the shimmer though and maybe down the road I'll add a Kessil to the T5 set up. The D2120 is a good quality product that gave me no issues and many others have had great success with them, lighting is only one piece of the puzzle keep in mind. I need to buy 6 new bulbs for my current fixture and it will cost me almost as much as the D2120 is complete. The D2120 is a fairly inexpensive fixture in this hobby and would be worth a try if you want to see if LED lighting is for you. I got mine on sale and ended up selling at a $50 loss which over the course of a year isn't so bad. Good luck!
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