I am thinking of getting a couple of these to go in my 75. How many can one put in a 75? I have 2 clowns and a tang in their now. Will they all get along? Where is the best place online to get them? My LFS does not get these. The tank is about 2.5 years old. No bashing about the tang in the 75 please, it has been in their for 2 of the 2.5 years and is doing great. I will move him when I feel the time comes. Thanks.