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I have a 20 gallon freshwater tank with 1 full grown male auratus. (he's black and purple actually, kinda cool)

My water has been getting cloudy quite often and my Local Pet Store guy suggested some fizzy tabs for algae. I did that. Two days later I notice these tiny whiteish spots on the walls of my tank, which seem to be Swaying in the breeze. Another Fish guy told me that they could be hydra and asked me all these questions about my tank, saying they only lived in high quality water. He also said it probably wouldn't hurt my fish.

I have also noticed, what looks to be like a few small worms (at first i thought it was a piece of tiny cat hair...until it started to crawl up the glass)

Anyone know what these are, if its dangerous, and what my next step should be?

Thanks all,
Bayou

hydra is a pain in the butt if your a breeder. had a tank filled with these things and they ate alot of my cherry shrimps. if you are not breeding anything then they wont cause to much harm. a hungry cherry barb can kill them. also that worm is probably one of the thousands of nematoads out there and isnt too much to be worried about. and probably get eatten by the fish if it see it.