tlcthis, I responded to your post about shedding elsewhere...
For me, the Aquaclear 70 in 35 gallons of water is pushing it a bit. I used a 110 in a stock tank with 30-32 gallons of water.
Aquaclear filters have a number of positives, but one of the negatives is their losing their prime when the electricity goes out. For me, the larger models are a little better than the smaller models (I've got the 110, 70 and 50) when it comes to that. The winter before last the power did go out briefly while I was away and came back on before I returned. The 110 and 70 were both working normally, but the 50 was running dry.
Strangely, the 70 has a lip, but the 110 and 50 don't. By cutting the lip off (it sounds like that's what you did), you've made it like the others.

All you need to do is silicone some plexiglass on to the lip. I have the plexiglass long enough so that it's just under the water level.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-