Purple build up

[jeharrisonjr]

What is this?

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[sprinklerdudes]

coaline algea , good job people actually want this stuff , its one of the signs that your tank is working propely

 

[sprinklerdudes]

if the aqurium is glass you can scrape it off with a razor blade, if your tank is acrylic you need a specil plastic scraper so as not to scratch you tank, i let it cover the back of my tank and all of my live rock,