okay i know the dragon goby is a "friendly" fish, so are all my others. i currently have a clown loach(same as random), some random fish(gf got this one from her friend and they had no clue what it is), also have two catfish "sharks" can't member what they are called now, also have some other catfish that we are trying to figure out as well we seen something like it at the local pet smart it started with a P(sorry for having a short term memory lapes)(but it's silverish with long whiskers and almost leopard like whiskers supposedly have some barbs or something on it idfk my gf got it from a friend as well).but i am wanting to know how well my other fish would react if i added a little bit of salt to the tank to help out the dragon goby. also right now my tank is a 55 gallon tank(long) or is my tank right now over stocked? also for filter i can't remember what exactly it is i know it's a marine land with the size C filters and it has a bio wheel. which doesnt say much either though. i know its one of the smaller ones now i just need to find the box i got it in from PO. right now all fish are mildly getting along other then the clown and the random fish. the clown is very skidish and hides under the one side of the air stone and the random fish hides in the bigger plant we have normally.....sorry if nothing makes sense out of my post.