Large white spot on head

I've not tried to scrub it off the plants to be honest. I wasn't sure if it was algae I just thought they were wilting and I was maybe missing out of some nutrients for them
 
The white patch is either excess mucous produced by the fish to cover an injury, or fungus that has infected an injury. Clean water and salt should fix both.

If pet shops won't take the extra fish, post an add at the local shopping centre for free platies or see if there's an aquarium society in your area. If there is an aquarium society, you can take platies to the meetings and donate them to the raffle table.

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Before you add salt wipe the inside of the glass down, then do a 75% water change and gravel clean the substrate.

SALT
You can add rock salt (often sold as aquarium salt), swimming pool salt, or any non iodised salt (sodium chloride) to the aquarium at the dose rate of 1 heaped tablespoon per 20 litres (5 gallons) of water. If there is no improvement after 48 hours you can double that dose rate so there is 2 heaped tablespoons of salt per 20 litres.

Keep the salt level like this for 1-2 weeks.

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.

If 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.

When you first add salt, add the salt to a small bucket of tank water and dissolve the salt. Then slowly pour the salt water into the tank near the filter outlet. Add the salt over a couple of minutes.
 

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