i have a water fall in my tank,,what if u were to use alge eater fish in there? heres a pic of my tank with the water fall in it,,,also just to say its a 175 gallon tank so plenty of room,,and i have live feeder fish in the water fall over flow,,

now this waterfall is hollow on the underside so the snakes even use it as a hide spot,,also i have feeder fish,,roseys and mice and crickets in the tank,,,so when the snakes get hungry,,well u know what happens then,,lol,,also my one garter has white looking eyes now,,so im assuming hes going to shed soon?? this happened with a corn i had and he shed soon after that,,,so if i change the water out every week it would be ok to run like this right?