How old is your tank? Cause if is a new tank you will need bacterias so they can promote healthy environment for your fish. Discard any plastic plant and check that you have a filtration sustem suitable for your tank.Take in mind that you will loose some fish while your tank get rid of something called new tank dissease. I will subject to buy the bacterias and leave the fishtank running at least 2 weeks prior to add another fish. If you dont want to wait, ask for hardy fish. I have 2 fish tanks 1 salt water and 1 RO water and use the same store, Aquatica, for the water and fish They have many new ppl working in Aquatica but ask for Ehab he is being there since day 1, knows a lot and can help you any time you have a question or concern about your fish tank. To beng an aquarist you need to have a lot of patience at the beginning but is worth it. Dont give up, good luck.
From my experience they offer high quality livestock thus the higher pricing...there is always risk when acclimating creatures to a new environment, and fish health a difficult thing to diagnose...as long as they are willing to cooperate when these situations occur I would not let it be a reflection of the establishment...
Just as everyone else has said, make sure your water is ok also make sure you have the right temperature also. As i see you want a tropical fish tank which usually is warm water like 75 and up and gold fish and koi like the water to be cooler 70 and below.
I have bought 7 fish from here (all have been saltwater) never had any problems staff is very knowledgeable with any problems you may have
Those fish are healthy you may have a parasite in your tank you need an ultraviolet light for your aquarium
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