Foam on edge of tank

[Cmlee]

Is there anything wrong if there is foam or a layer of small bubbles on the edge of the tank?

[Cmlee]

Anyone know if this is normal?

[Urban Aquaria]

It can happen in tanks with added surface agitation, ie. from sponge filter. All the bubbles and movement gradually creates foam in the layer of bio-film on the water surface... it can also be an indication of higher bio-load from livestock and food that is producing all the extra bio-film on the surface too. You'll just have to scoop out the foam periodically.

[edric]

Probably a sign that you're overstocked... Maybe its because of melafix? Haha melafix makes the water foam