I have a nacarious snail, turbo snail, fire shrimp, and an emerald crab to try and keep my tank clean. But it doesnt seem like they can keep up with the algae growth/ maintainence. Its 13.5 gallon tank and the turbo was put in 4 days ago and not much has been cleaned besides a little here and there off the rock. It doesnt seem like my nacarious snail is doing much with cleaning the sand. Any suggestions, opinions, knowledge would be greatly appreciated!