Um why do you have a turtle ramp? as they don't need it.
Brine shrimp is from salt water and you should feed a fresh water animal freshwater things not salt water animals, good things are:Blood worms,earth,worms,pellets and some axie tucker from the pet store.
If he has intaken pebles you must take them out! also trie tp get some fine river bed sandfrom exo-terra on tm, or use some big rocks a bit bigger than their heads. As with it being full of pebals there is not much you can do but wait.