Hello, I have a 20gl tank with currently 1 BN pleco, 4 nerite snails and 1 juvenile- medium sized, very timid angelfish. He has been in there alone for about 2 months now and I would like to get him another tank mate. I was looking into a pearl gourami since they are said to be one of the more passive type of gourami. Is this true? And do you all think that they could get along? Any suggestions would be appreciated. Thanks!