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I am almost certain to go with an acrylic tank, but do algae eaters scratch acrylic or do cherry or amano shrimp

can you clean acrylic with a synthetic sponge. I am not talking about a scraper.
 

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Carpe Diem
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No and yes.

I'v been keeping otos and bushy nose plecos in my acrylic tank for 10+ years and I cannot find any marks from them.

Use the white colored sponge only, not the blue one.
 

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What I've found will scratch tanks is substrate. Sand, eco-complete, gravel, even hardscape. If I clean the tank with a sponge and some sand gets trapped in the sponge, it's easy to scratch the tank. I've done it... a lot :(
 

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Only if they don't trim their nails...

You'll mostly get substrate scratches when you aren't careful moving stuff within the tank or vacuuming
 

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The only freshwater fish that scratch acrylic are larger plecos, pufferfish, and some of the larger cichlids.
 
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