Microbubble Thing

[smurfyy_2k3]

i just got a microbubblething from a friend it has a blue light on and i can vary the amount of bubbles it creates what are these for?

i think its a bit like a small inaffective filter it even has a sponge in it? please tel me the purpose of this the fish seem to like the buubles!

 

[Chri$]

an airstone??

 

[smurfyy_2k3]

not an airstone it has a power lead

 

[Chri$]

prob just a small filter then.