Help Identifying Sea star

Below are pictures of my sea star that I have had for about 1 year.
It was a gift from my past housemate who bought and introduced it to my tank while I was away (bit annoying but since it didn't affect my clownfish, tank balance and it survived I'm not so bothered now). However, I was told it would keep the tank clean. But it doesn't do a very good job so now I'm wondering if it even eats algae or whether its just been eating my clown fishes scraps. I have struggled to identify him to find specific care instructions, so thought I would ask here. See description and photos below (will post more photos if necassary):

Colour and texture: Brick Red with flat scales
Size: 7 cm across from tip to tip
Tank mates: Just 1 clown fish (only 5cm)
Tentacles (under arms): can reach approximately 4mm (observation)
Arms: 5 with tips that always turn upward
Mouth: (Will update photos and description when he moves onto tank wall)

Hello and Welcome!

I cant give you the exact species, but i think its in the Fromia family.

Saltwater Aquarium Starfish for Marine Reef Aquariums: Marble Sea Star, Assorted

If you want something to clean the sand you should get some nass snails.
Saltwater Aquarium Invertebrates for Marine Reef Aquariums: Super Tongan Nassarius Snail

Excellent! Thank you, that does look more like it.

Welcome to the site...lil fish has you covered.