it turn out i have, what have no been positivly I.D'd as watermites in my turtle tank.

can you please give me some advise as to how these could have gotten into my tank, and also some advice as to how to get rid of them. thanks
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mother to ,1 female great plains rat snake - "rockey". 1 male amel corn - "SN4". 1 female bairds rat snake - "copper". 1 female normal ball - "queenie". Pair albino striped king snakes - "tom and jenny". 1 male normal Cali. king - "wallace". 1 male pet rat - "rax". 4 cockateils, 3F, 1M, - "squeak, arnold, piere, peppy". 1 female rock pebbler - "fudge". 2 female roborovski hamsters - "speedy and sprite". 2 Florida Cooters - "tiny and titch". 1 male African Grey Parrot - "george". 1 Red Naped Conure - "jake", and finally 1 female german shepard - "roxy"