pondholler
New Member
Our filter system in our 300-gallon tank may be old tech (we resurrected it from a 20-year-old set-up) but it used to work just fine, so we're using it again. My question is, now that the pumps are running, the filter box with the balls in it is only filling halfway -- i.e. only half the balls are completely submerged. Is this correct, or should all the balls be under water? (We can't remember how it used to work). Thanks.