08-02-2009, 04:21 PM
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To add a comment on the mollies with goldfish, the answer is no. Goldfish are not tropical, mollies are; that is, the mollies need warmer water than goldfish will appreciate. While you may have done this previously, with or without problems, it is only asking for trouble because the temperature will be either correct for one of them or incorrect for both, and that leads to stress for the fish that are not comfortable with the temperature. To be healthy in a community aquarium, all the fish must share approximately the same water parameters, being temperature, pH, hardness, and salinity. Forcing any fish to "adapt" to conditions that are foreign to their natural biology will cause stress and that usually leads to poor health, disease and sometimes death. As you have goldfish, I would stay with them. Although JohnnyD is correct, you need more tank space to keep them healthy, and in the least you must be regular (once a week minimum) with partial water changes.