Hang on,Whisper type filters are practically worthless IMO for a reef tank,they can be modifed and used as a carbon filter but if you have a sump,there's much better ways to DIY carbon filtration.In a reef tank,you do not want to use mechanical filtration(filter pads,sponges,etc.).The only mechanical filtration needed is via protein skimming.CPR backups use strips as a media for bacteria filtration.External bio filters are not needed and often hurt water quality in a reef tank.I would remove these strips and just use it as a protein skimmer until you can find a larger skimmer,more suitable for your 75.If you havn't already,remove your filter pads from your Whisper and just use them for circulation.For a 75,I would recommend a sump pump that will do 750gph after head loss(about 950gph pump).You will also need at least 3(5 would be better) more sources for water movement inside the tank.You can use powerheads to accomplish this.
Why would you use carbon as a method of removing the cloudiness? Carbon is used to remove chemical impurities in the water. There is no need to filter out the cloudiness, it will settle on it's own and if you are getting sand storms causing the cloudiness still, move teh water direction so it's not blasting the sand bed.
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