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I hope your tank is large enough for the 7 or 8 inches of fish you have in there. (1 inch of fish needs 1 gallon of water). Shortage of oxygen will cause fish to go to the top/surface for air. However Guppies (Poecilia reticulata) are naturally surface feeding fish so that is where I would expect them to spend most of there time. Surface feeders are easy to recognise simply by looking at the construction and shape of the fishes mouth. Note that it tends to open in such a way as to skim the surface of the water.

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16y ago

What else can I help you with?