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you dont have to replace your sand, how about you start doing a gravel vac with your water changes to get the junk out instead? I do this about once every 4 water changes as a preventative. Some people think disturbing the anoxic area at the bottom of the sandbed is bad but i feel like having clean sand is key to keeping nitrates and phosphates from building up.
I would def check the water source with a tds meter and continue the frequent water changes until the problem is better.
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