Sometimes, when the gravel is very dirty, it takes several days of gravel washing to clean the gravel. If your fish live in an aquarium, it must have an external power filter with a bio-wheel or our warranty is invalid. Not an undergravel filter, not just an airstone or bubblewand, but an exterior power filter hanging on the back of your aquarium. Check your filter, make sure it's pumping properly, and scrub it with a sponge if it's dirty. Replace the filter's pad if it's dirty.
Fish do best in an aquarium with a bio-wheel.
If your filter has a bio-wheel, make sure it's rotating. Aquarium Heater . If you order warm water fish from us, your aquarium must have an aquarium heater and a thermometer. Adjust your aquarium heater to the proper temperature range . To the Top of this Page. 6.