Sea Urchins and acryllic tanks

I have two

I have two

Long Spined and a Pincushion, both dont scartch the acrylic, but thier small right now. I think the worse damage to the acrylic comes from the magnet and sand period!

Investing in a great magnet cleaner will help and a good amount of snails, to avoid constant brushing and scrapping of the acrylic.

Just my two cents.
David
 
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