Awesome! This gives me alot to go on! I am hearing ALOT about quarentining. Is there a smaller cheaper method to accomplish this? Only reason I ask, is we are in a apartment. Only other tank is my fiance 10 gallon jbj. Don't think that's fitting for a quarantine hahaI believe it depends on the tangs, and flexibility in future. My 4 are powder blue, lieutenant, lavender, and koles. Also have an orange spotted rabbit. The rabbit is fitting too large, so he is moving to a 210. In my other 210 I have bigger tangs desjardini, sailfin (yeah I know they are too similar, but on line orders and the sailfin was too large to go in with the other tank so I switched the powder blue with it introduced almost all of these tangs same time when I added the 210) Tomini, scopus, regal blue, and two scribbled rabbit fish. Never had a single problem with aggression after first few hours in QT. That being said I have a 160g and 2 210g tanks so I have options if the get two big. But I would say go with 1 tang or Three tangs as two sets up for one on one aggression whereas three allows for distraction. I also have enough rock that there is an almost full wall of rock with lots of caves, holes and hiding spaces that each fish can find a suitable home yet large open swim lane in top 6” and full length on front top to bottom and behind with exception of a couple rocks leaned on back wall for stability. This gives the cruisers plenty of room to swim.