If your filter materials were in a bucket of tank water, then most of the beneficial bacteria will still be alive. If the filter materials dried out then the bacteria is dead.
What are you adding to the tank to treat them?
You need to treat them for bacterial, fungal and protozoan now. The red in the angelfish's dorsal fin is a bacterial infection. The white fluffy stuff on the angelfish's dorsal fin is fungus. The fin is being eaten away by bacteria and protozoans. The guppies have a protozoan infection too.
You need a fish medication with methylene blue for the bacterial and fungal infection, and malachite green for the protozoan infection. If it contains formaldehyde then that will help. Fortunately most broad spectrum fish medications contain these ingredients.
You need to do wipe the inside of the tank down, do a huge water change and complete gravel clean, then treat immediately. If you don't treat this properly, you will probably lose all the fish in the tank.
You can also add 1 heaped tablespoon of salt (rock salt, swimming pool salt or sea salt) for every 20 litres of tank water. This will help with the fungus and protozoan infections, as well as help reduce the stress on the fish.