It's the waterfall style filter from BOYU (this is the brand available in my country, so if you recommend me any other brand, sorry I wouldn't be able to get it). I'm using it for my 2 gallon betta tank. Last night it filtered my tank well. There's no strange sounds and my tank's water got clear. But today, I realized that the filter is making strange sounds like "pep pep prep pep prep pep pep" as if it's having a hard time sucking the water from my tank when the water is circulating well. Anybody knows what's wrong?
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