I have a 29 gallon Oceanic Bio Cube that's been running for about 2 months with about 35 lbs of live rock. Water chemistry is good (ammonia-0, Nitrites-0, Nitrates-5ppm, pH-8.3). I have a Percula Clown and a 6 line Wrasse. I also have a fire shrimp, 2 leather corals, and a Hammer Coral.
Unfortunately, I've had 2 Royal Grammas die on me at separate times. First one lasted 10 days and I found him in the middle filter section of the tank (wet/dry section). Then after doing a water change, I replaced him with another Royal Gramma but I found him dead only 4 days later on the bottom of the tank.
I acclimate new fish carefully using a drip method for about 90 minutes.
Everything I've read tells me Royal Grammas are ideally suited to a reef tank set-up. I love the colors on these fish and would like to try again but I don't want to do harm to any more of these till I've got it figured out. Is it a trend or just a coincidence??