I like to plan WAY in advance and currently have an empty 210 gallon tank, with a 40 gallon sump. The plan is, maybe years down the line as we are moving within the next 2 years, id like to set it up, or maybe even a larger tank, as a large mixed reef. The issues is, as i was going over what fish id like to include, I realized i want a blue mandarin dragonet, red mandarin dragonet, and a yellow spotted mandarin/goby. I know males would fight, but was wondering if 3 would likely get along in a 210 or larger. Ive had mandarins before but only singles. Just curious, as im making my future wishlist.