I've been hearing birds need to be wormed, which I have got some from the pet store (haven't used yet) . Is it really necessary to worm birds that aren't showing any signs of worms? I'd assume it's got quite a lot of chemicals in the dewormers, and the one I have is very strong (1ml per 9kg) . If I need to use it is there any effective natural alternatives? I will use it if needed, just wanted to double check.