Hello everyone, I have a 20 gallon tall glass tank that I got about three months ago. I have a couple saltwater acclimated mollies in it along with a blue damsel. These were used to cycle my tank. There is also about 10 to 15 lbs of live rock along with 3 inches of live sand at the bottom. Ammonia and nitrite are 0, ph is 8.25, SG is 1.023, nitrates is 15 ppm and the temperature is 76-78 degrees F. I plan on returning my blue damsel back in my other saltwater tank, his original tank and I plan on reacclimating my mollies back to my 10 gallon freshwater tank. I'm really, really interested in dedicating this 20 gallon saltwater FOWLR to a copperband butterfly and a pair of cleaner shrimp. There's just one problem though. I'm afraid of just running to the store and grabbing one of these beauties because I've heard so much conflicting information, some say it's easy to keep while others say it's very difficult to almost impossible to keep. Is there really a catch to keeping these fish or are they just relatively easy to care for? Any info will be greatly appreciated!!!!!! Thanks