You are getting micro bubbles. You need to have foam or baffles around your return pump to stop the bubbles from getting to the pump and up to your tank.
If the tank was recently setup, give it time and it might clear up. If it doesn't clear, your return pump may be pushing more water than your sump can handle. What return pump are you using?
If the return volume is reasonable, it also could be an air leak in your plumbing.
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