[seattleguthries]

This algae has been showing up in my tank recently. I run a 20 gallon tank, 48 watts of t5 lighting, injected co2 and fertilize with aquariumfertilizer.com's Macro Micro Nutrient Mix.

I also run a UV sterilizer 24/7 that I initially installed to combat green water.

This algae (bacteria?) grows in a kind of slimy blob that can be found on the substrate and on plant leaves.

I appreciate any help you can offer.

 

[izabella87]

Looks like moss balls... but im not being serious saying this.. and I wont be very useful saying you're being attacked my aliens blobs. Perhaps someone else would be more qualified to solve this puzzle.

 

[samamorgan]

Strange, they look like marimo balls, which are a form of algae that aren't bad at all. If thats what they are, dont kill em!

http://en.wikipedia.org/wiki/Marimo

 

[Rev_jim_jones]

It is a Blue Green Algae. It forms hollow balls, sheets, or filamentous masses. It is a cynoBacteria.