Waste Floats Around After Gravel Clean

Part of why you have brown algae is that there is a ton of nitrates in your tank from never changing the water. The algae loves nitrates.

You need to rehome the pleco and the sharks.

You can buy an algae sponge and remove the algae yourself. Do partial water changes weekly. And vacuum the gravel regularly.

Also a good idea to get a test kit for ammonia, nitrite, and nitrate readings, and tell us what the results are. Most people recommend the API Freshwater Master Test Kit. It's priced best on Amazon than in stores.
 

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