I'm very sorry your babies are sick. Are they Betta Fish? What kind of fish are they? Are they in the same tank together? What is the size of your tank? How long have you had Blue and Max? we need more specific information to give you more answers. Please post more info on your babies' living situation.
Fin rot doesn't necessarily start at the end of the fins. If he's a Betta Fish, you could try Betta Fix, in addition to doing complete water changes more often. Since you removed his plant, does he have anything else to hide behind or under? He could be skittish because he doesn't have the comfort of his own little hideout - a respite from the world when he needs it.
The fuzzies could be Ick. More frequent, complete water changes help, but also the old-fashioned salt bath.
Also, how long has it been since you set up this tank? You know you can't put the fish in right away, right? And, please get a water test kit and test your water right away if you have not done it, yet. What is the water temperature of their tank?
Could you send us a photo or video of your fishes in their tank?
Hope this helps. I hope they are getting better. Please update us - and more detail about your fish and their environment would allow us to help you more.