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Hi, my rena xp-3 (xp-l) filter will not stay full. when i manually fill the cannister and plug in filter it works fine but after a couple of hours the water in the cannister drains and you can clearly see a waterline and that its not full like i left it. Any ideas on why this is happening? PS. already tried tightening hose clamps and i got metal ones to replace the plastic ones it came with.