that will help alot, but you always have some die off still.
Just keep an eye on the parameters and wait for things to level out before going to the next step.
My :twocents: on the clean up crew:
1) Don't go with the starfish from the start.
2) I wouldn't (my personal opinion) use hermit crabs, had way to many pull snails from the shells, blue leg, red leg they will do it if they want a bigger shell.
3) What I would and do do is use a mixture of different type snails. Depending on the type they will eat different things. Some eat hair algea, some eat film algea and cynobacteria, some eat fish waste and extra food, some even will stir up the sand bed.
Again just my two cents others do differently and it works for them. If you want I can get more specific on different types of snails for you, but didn't want to go off on that long tangent if you weren't interested.
Good luck and remember whatever you do add them slowly... it is appealing to get the 20 at a time because they are cheaper in quantity, but you might then end up with 20 snails that dont have anything to eat and all die causing spikes in ammonia etc... slow is always better.
Brandon