I have kept worms for a few years now and can confidently say that your worm bin is just fine. The biggest indicator that you have an issue is worms packing up and getting out of dodge. They will literally climb out of the container and you'll find them half way across the room all died up and shriveled. If things are good, they will stay put.
Furthermore I wouldn't bother spending money on peat, coconut coir or anything else like that. I used to use shredded paper as bedding but I don't even bother with that anymore.
I also used to stress about not having
enough moisture in there (my worm bin has a sump that drains excess moisture) but I've found that they get all the moisture they need from the food scraps and I need to drain the sump maybe once every 6 months or so.
I feed them tea leaves mostly(I empty the tea bags because they are made of plastic and are a pain in the A to remove later), and add banana peels, potato peels, vege scraps (not onions or garlic), spoiled fruit and cores (but not citrus), and squash / melons.
Every so often I'll get a fungal bloom but I think it's just a normal part of the decomposing cycle. The worms don't seem to mind it. Similarly every so often I get a cycle of seed germination. Apples, pears, cucumbers, squash... Again, the worms don't mind it.
They really are great workers.