I just purchased 3 green moss barbs and 3 albino tiger barbs this past Sunday. They're quite small but all looked lively that day. The next day, one green moss barb was resting on the bottom of the tank, so I put him in a floating breeder tank (since I am still in the process of acquiring and setting up a quarantine tank). His stomach is recessed but he still eats. He doesn't have anything growing on him (or any other noticeable external condition), though a friend mentioned that he may be gilling. This morning as I rushed out to work, I noticed 2 of my 5 tiger barbs (I've had them a while - they're large) looked lighter in color, and were moving their side fins and their mouths rapidly while staying in place (which actually all 5 barbs were doing when I initially moved them into that tank, but they all regained their color and returned to normal activity after 2 days - this was weeks ago).
Can someone give me insight as to what the problem may be and how to go about addressing the issue? Unfortunately all sites I have been searching don't seem to have similar symptoms listed and I do not know where to continue my research.
[The aquarium is a 20gallon Long, has been set up for 4-5 months, has 5 tiger barbs (near full size), 3 small albino tiger barbs, 3 small green moss barbs and a young albino rainbow shark (I plan on getting a larger tank in the next couple of months once the little barbs and shark begin to grow). There are 2 small plants (unsure of the type), I'm unsure of the type of filter, no CO2 unit, receives very little natural sunlight. I changed 3-4 gallons of water last week.]
Can someone give me insight as to what the problem may be and how to go about addressing the issue? Unfortunately all sites I have been searching don't seem to have similar symptoms listed and I do not know where to continue my research.
[The aquarium is a 20gallon Long, has been set up for 4-5 months, has 5 tiger barbs (near full size), 3 small albino tiger barbs, 3 small green moss barbs and a young albino rainbow shark (I plan on getting a larger tank in the next couple of months once the little barbs and shark begin to grow). There are 2 small plants (unsure of the type), I'm unsure of the type of filter, no CO2 unit, receives very little natural sunlight. I changed 3-4 gallons of water last week.]