Do NOT put that in your tank. Throw it away, right now. It sucks you paid for it. But take the loss now. Google ulva reef tank. That **** is super invasive. It will send out “spores” or whatever and it wil start growing in thousands of shards. It will outcompete any algae.
I had to break down a 150g because it did this. It had tens of thousands of shards of it growing everywhere and bottomed out my nutrients killing coral. I couldn’t even dose enough nitrate and phosphate to keep my levels above zero. It grows like crazy.
This **** shouldn’t be sold. Algae barn shouldn’t sell this, nor anyone else.
Edit: most stuff will not eat it. Some say tangs will, but it’s a bit or miss. I had 3 different tangs that wouldn’t touch it.