The Elephant Nose is an interesting fish. Its body is mostly black and is irregularly shaped with a long narrow tail and what looks to be its nose however this is actually an extension of the fish's mouth.
Anything that goes into your tank that has been in another aquarium or natural body of water could potentially have algae on it. This would include plants, fish, snails, or any other living thing in your aquarium—including the water they came in with. Fish, shrimp, and most animals will be your least likely culprits. The shells of snails often have algae growing on them. Plants, as well as any decorations and equipment that have been in another aquarium, will most likely have some types of algae growing on them.
If you have a Saltwater Aquarium, no doubt you have seen Red Slime Algae (Cyanobacteria). You need to jump on it promptly to prevent it getting worse, plus address the water quality issues that causes it in the first.
If you have Red Slime Algae in your tank you will want to take immediate measures to get on top of it. We can provide some instruction on that