Those look similar to the gloves I wear at work as part of my required PPE; they are amazingly resistant to cuts but they are pretty useless to protect against punctures. A bite will hurt, especially a bite-and-shake.
To put things into some perspective...this is a 10-inch fish, not a 10-foot Siberian Tiger. There is not too much decor in that tank. It's not difficult to make an opaque divider attached to a handle, isolate the fish in one end while cleaning the other, and then reverse. Make sure the fish-containing half is kept covered during the operation.