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I would scrap the HOB and get a good one for your sump. Paul, redfishbluefish, has a nice one for sale.
I agree its the air intake, had this problem many times, salt builds up inside the plastic part of pump and prevents air.
I would have to use a toothpick and clean it out every week or two.
It's been 3 years at least and wanted to make one. Especially after I saw their tanks at one of the other meeting they hosted and was looking forward to seeing the new setup bummer. On a happy note I will be attending my grandson's birthday this day.
Thanks everyone. I ended up using the small mag float and then replaced the blade in the other one. I also moved the blade holder to the other side so it would be closer to the glass and that seemed to work better.
I am having trouble keeping the front glass clear of algae. It's a 45g bow front and I have the scraper which holds a straight edge razor blade but still not very effective. Any suggestions appreciated.