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My black moor goldfish keep swimming to the top of the tank and make the kissy faces.. Not sure if they are trying to breathe. Or they are just hungry. One fish usually stays at the bottom of the tank but occasionally goes up and swims. They also try to grab the little pebbles at the bottom of the tank. They eat all their food but why are they always at the top??

My black moor goldfish keep swimming to the top of the tank and make the kissy faces.. Not sure if they are trying to breathe. Or they are just hungry. One fish usually stays at the bottom of the tank but occasionally goes up and swims. They also try to grab the little pebbles at the bottom of the tank. They eat all their food but why are they always at the top??

Updated On March 26th, 2018

Pet's info: Fish | Unknown - Fish | Male

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Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

Veterinarian

Usually lack of water quality, lack of oxygen, overcrowding and abnormal temperature are all common causes of this behaviour. They could be hungry as well, but usually they come to the surface at certain time or in response to visual stimuli like your presence.
Begin by submitting a water sample for quality testing. Most pet stores will do this for free or a nominal fee. Clinical examination should always include a water quality check, even if you have done so already. Water testing should be performed with a quality test kit, measuring NH4, NO2 and NO3. High ammonia levels, PH imbalances may be responsible for these signs. Oxygen concentration and quality of the filters should be determined as well.
If water quality is good and there are no major imbalances, your fish should get examined to look for any sign of bacterial/fungal infection and eventually water should be treated.
Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

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