I don't think animates should pay for the treatment, part of the fault is your own for buying them in the first place and not QTing them. Slowly raise your water to 30, depending on what else you have in the tank (the danios might not do well with this temp) and treat with some wunder white spot cure (I think) at the dosing on the package. It will also partly help with gravel vacs and 50% waterchanges (to remove the cysts)