Mixing medications is a quick way to poison fish. Most medications are dosed at a level high enough to kill microscopic organisms but not high enough to kill the fish. However, if you mix medications, you can easily overdose the tank and poison the fish.
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How long has the fish had the white dot on the pectoral (side) fin and the tail?
If the white dot on the pectoral fin and tail have been there for more than 1 week, it is not white spot.
The safest way to treat white spot is to raise the water temperature to 30C (86F) and keep it there for at least 2 weeks, or 1 week after all the white dots have disappeared.
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The white marks on the face are Hole in the Head disease and minor cases can be treated with salt and clean water. More advanced cases need Metronidazole.
Hole in the head disease is caused by Hexamita and generally occurs in cichlids kept in dirty tanks, overstocked tanks, or tanks that don't get cleaned enough.
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Treatment is as follows.
Wipe the inside of the glass down with a clean fish sponge.
Do a 75% water change and gravel clean the substrate every day for 2 weeks. The water changes and gravel cleaning will reduce the number of disease organisms in the water and provide a cleaner environment for the fish to recover in. It also removes a lot of the gunk and this means any medication can work on treating the fish instead of being wasted killing the pathogens in the gunk.
Make sure any new water is free of chlorine/ chloramine before it is added to the tank.
Clean the filter if it hasn't been done in the last 2 weeks. However, if the filter is less than 6 weeks old, do not clean it. Wash the filter materials/ media in a bucket of tank water and re-use them. Tip the bucket of dirty water on the garden/ lawn. Cleaning the filter means less gunk and cleaner water with fewer pathogens.
Increase surface turbulence/ aeration when using salt or medications because they reduce the dissolved oxygen in the water.
Add some salt, (see directions below).
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SALT
You can add rock salt (often sold as aquarium salt), sea salt or swimming pool salt to the aquarium at the dose rate of 2 heaped tablespoon per 20 litres of water.
Keep the salt level like this for at least 2 weeks but no longer than 4 weeks otherwise kidney damage can occur. Kidney damage is more likely to occur in fish from soft water (tetras, Corydoras, angelfish, Bettas & gouramis, loaches) that are exposed to high levels of salt for an extended period of time, and is not an issue with livebearers, rainbowfish or other salt tolerant species.
The salt will not affect the beneficial filter bacteria, fish, plants, shrimp or snails.
After you use salt and the fish have recovered, you do a 10% water change each day for a week using only fresh water that has been dechlorinated. Then do a 20% water change each day for a week. Then you can do bigger water changes after that. This dilutes the salt out of the tank slowly so it doesn't harm the fish.
When you do water changes while using salt, you need to treat the new water with salt before adding it to the tank. This will keep the salt level stable in the tank and minimise stress on the fish.
