If the toe is red and swollen - it would be best to have it checked by a vet. he may have just snagged a nail, but he may also have broken his toe or foot. Only a vet would be able to make a diagnosis.
If you cannot locate a vet - keep a very close eye on him. If the toe turns darker - or even black he will absolutely need vet care and possibly amputation of the toe.
DO NOT TRY TO CUT THE NAIL ON THAT TOE UNTIL IT IS NO LONGER RED.
It may heal on its own, but it may also be very painful for your glider. Trying to hold his paw and cut the nail may increase his pain. Unfortunately, some gliders respond to pain by trying to CHEW AWAY the part that hurts. If he begins to bite at the toe - he will need to be put in an E-collar (cone) and be seen by a vet for pain medications.
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If it's about diet I feed him worms and apples/pears every night with glider calcium.
He absolutely needs to be on a better diet. Pellets are not an appropriate source of protein and nutrients for gliders. Their digestive systems are just NOT designed to process hard dry foods as a main source of nutrients.
For now - you need to offer a wide variety of fruits and vegetables each day. He also needs a good source of protein - meal worms are not adequate as a protein source - they are mostly fat. You can offer egg (hard boiled or scrambled no seasonings) or cooked plain chicken as protein until you choose a feeding plan to follow.
I have links on my web page to several widely used glider feeding plans that have a nectar like staple that will provide the protein, vitamins and calcium our glider needs and are fed with a wide variety of fruits and vegetables.
http://www.gliderkids-diet.com/
Look them over and choose one to prepare for your glider to make sure he gets the nutrients he needs. Sprinkling calcium on foods is more likely to over dose your glider than to give him the correct amount he needs. Choosing a staple that will provide the calcium necessary is the best way to ensure he gets the proper amount.
please ask questions if you need more information of feeding your glider.