Aquariums in general need a variety of life to sustain them. Generally, what I recommend to my clients that they need a few of each different kind, because each kind contain different qualities and behavior characterisics that make them beneficial.
Nassarius snails, Turbo snails, Astrea Snails, Margarita snails, blue leg hermits, red leg hermits, green hermits, emerald crabs, yellow tangs, foxface fish, algae blennies, cleaner gobies, cleaner shrimp, coral banded shrimp, peppermint shirmp, brittle stars, sand sifting starfish, red grassalaria, chaetomorpha, caulerpa mexicana, ... and on and on.
Everything listed above and many more have many different useful behaviors and characteristics. You need to study and learn everything you can about what they do. Each one can solve one of your problems by natural means, not chemical. Research is key!