My niece recently set up a 5 gallon fish tank with some mollies, and a sucker fish. The water was clear when she set up the tank with filter and aerator. Within a day, the water became cloudy but there was no smell. She is not overfeeding, and the fish appeared healthy. She has changed up the water, moved them into a 10 gallon tank and now a day later the water is very cloudy again. It almost looks filmy. The sucker fish died, so she plans to replace him, but I would think a day without the fish would not be a problem. She's thoroughly cleansed the rocks, filter components, aerator hoses, and the few rocks and castle that are in the tank. There are about 6 mollies and they did have around 8 babies which are in a small flotation tank to keep them apart. The pet store suggested some clarifier which she added yesterday, but after 24 hours the water is just cloudy and some of the fish seem to be struggling. Any tips or suggestions would be welcome. We've had fish before and never had this problem. We're starting to think maybe the fish are unhealthy or have some sort of condition we are unfamiliar with. Your help is greatly appreciated.
