Sponge prefilters and water flow

• pH:
• Temp:
• KH:
• GH: 9
• NH4:
• NO2:
• NO3:
• PO4:
• Iron:
• Dosing: 5 mL Flourish, 5 mL iron chelate (0.5 ppm)
• NO3:PO4 Cumulative Dosing Ratio:

Notes:
I noticed that after almost two weeks, the DIY sponge prefilters that I put over the intakes of the filters are getting clogged and are significantly slowing down the flow rate of both filters. The AquaClear filter has slowed to a trickle, and the Eheim canister is starting to get air in the canister. I'll probably have to clean it out tomorrow and clean it more regularly after that (every week). On the other hand, assuming I clean the sponge prefilters regularly, that should hopefully cut down on the need to clean the filters as frequently.