I have Black Diamond blasting sand in my 75 gallon tank, and it keeps getting in the filters and stopping the pumps. It's already destroyed one AquaClear 110, and it keeps getting in my Aqueon 55/75, even though I've put foam over the intake. What do you suggest I use? I have a new AquaClear 110 coming in the mail today, and I don't want sand getting in it.