Help White worms

[Aquaria]

Thank you they look just like em i started a cleaning last night, added salt and hopfully by sat ill have a worm free tank. as for my fish i do know its to small a tank i got them as babys pleco after 3 monts is only 4inches hes a regular pleco, my bala is only 2 inchs, i am getting a 75 gallon in a month or two and am making the 20 gallon a bedroom tank prob a fancy guppy tank or somthing along those lines any advice in makeing a calm 20 gallon bedroom tank would be cool im open to all ideas