Yea, you can put scrubbies and bioballs in the same place. They basically serve the same purpose.
KaiserSousay;4854318; said:do I need to buy more bioballs? The tank has been running for about a week-and-a-half now
You didn`t say anything about what is in the tank.
Are you fishless cycling?
Are you just running it for testing, to be sure all the mechanicals are doing their thing?
I`m sure there is a general formula for how much bio media supports "X" number of fish. Just not sure where it would be.
Without knowing what your stocking plans are, can`t really tell whether the media you have is enough or not.
BTW: Having a pick up truck load of Bio Media does not guarantee successful tank, right?