So my 90 gallon tank I bought used came with a. Sump that was running bio balls. Seeing that I was just starting up the tank I used them and then later added maxspect bio blocks and bio spheres. What I’m wondering is can you have too much bio media? And does anyone even use bio balls anymore? I read a book recently that said some people had better coral growth removing the bio balls? So are they a thing of the past?
Here’s the bio media I added to the sump:
Here’s the bio media I added to the sump: