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yes! there are many very harmful types of bacteria in feces which can make you very ill!
Yes. Worms will upset the internal workings of the cat to the point that it cannot fully control its anal sphincter.
sometimes people use filters. it cleans the aquarium UV Systems are becoming more popular for swimming pools and aquariums, UV light destroys bacterial growth, even fecis, As far as aquarium sealants and Coatings or paints, I highly recommend a product called "ArmorGuard" This will permanetly seal or coat your aquarium, It is a 100% Epoxy Coatings, Certified Green, Non -Toxic and Odorless. look on www.ecosmartepoxysystems.com for more information.
that is not a very good sign , feed it more , the only other explanation i can give is that if the lizard hasn't had proper supplements then they can not only create bone deformities but also brain imbalances , its actually common to see (sorry don't mean to insult ) mentally disabled chameleons with special needs, is he skinny? or oddly shaped in anyway , advise : clean deification immediately afterwords . or a screen with suitable mesh size , not dangerous to the lizard but enough to allow the fecis to fall through and be un reacable . what typ of chameleon is it?