rafatoy
Aquarium Advice Activist
i have a 55 gallon hexagon saltwater tank and i am using a wet/dry sump. and was wonder if the bio-balls should be under water or should the balls be half way under water. have also been told to add a bio meadia filter under the bio- balls. anyone know why i would need that. i thought that was what the balls were for. I did not ask what bio media filter is? Help