What is this floating dusty algae?

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AmberW

Aquarium Advice Apprentice
Joined
Feb 2, 2012
Messages
22
I have this grayish dusty-looking floating algae in my tank. It has been growing rapidly for the last few days.

Here is my tank history:

29g
tank is about 6 weeks old and is cycled (I got an old gross filter from a random person I met at LFS)
I started with cichlids but took your advice that my tank was too small and returned them
I replaced them about a week ago with a leapord puffer and four pristella tetra and the guy gave me a few of the snails for free. (no idea what kind they are) Bad idea?

The puffer died within 24 hours ( He looked slow and sluggish at the store, shouldn't have bought him)

The pristella are still going strong.

When I had the puffer in the tank I put a tiny piece of frozen brine shrimp in the tank for him. I did not rinse it (like I learned I should have tonight).

NOW, there is this grayish algae sitting on everything and when i move the water it floats around in the water.

What is it?

Thank you
 
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