I work for a rental company (houses, apts that kinda stuff) and I often have to go into places that are not in the best condition. Well last Friday I was in a house that had a TON of cats. When I got home I noticed a flea on my jacket, I killed it as soon as I saw it. Now last night I was changing the water in my BPs tank and found another flea floating in his water dish.

I know that mites can be a problem but I don't know anything about fleas.
I'm super worried about him and don't really know what to do...
Help?