Here is list of some known mistakes in setting up aquarium and solutions for them.
- Use of chlorinated water. Chlorine is an extremely toxic substance to aquatic inhabitants.
Solution: In emergency cases, move your fish to some jar with pure distillate water or any other water that you can be certain do not contain any chlorine or other hazardous material. Provide aeration to the jar and let your fish heal. Do not feed the fish at this point.
Leave the filter on in your tank. Chlorine will be disappear on its own after some time around 24 hour and good water circulation will fasten the process. After 24 hour, the chlorine in the tank water should be gone, and if your fish in the quarantine jar is already healing, you can safely put them back to the tank.
To avoid future problem, allow chlorinated water to settle for at least 24 hour in a container before use for the tank. There are also agents sold at pet store to dechlorinate water. With this agent use, you can safely use chlorinate water to your tank. Just make sure you put in the right dosage, usually listed in the product.
- Mixing different type of fish
- Putting in a bunch of fish directly
It is better to put in the fish gradually.
- Overfeeding
- Overwhelming algae
Solution. See if your tank is getting direct sunlight. Direct sunlight will fasten the alga growth in several folds. If possible move your tank to place where it does not exposed by direct sunlight. Also do not leave on the lights in your aquarium all day long. You should cycle the lights on and off periode. There is timer for lights sold in the pet store.
If you are using fertilizor for your plants, use them with great care and not doing it excessively as any excess in nutrient that is not taken by the plants will be used by the algae.