There's an oily looking substance on the surface water of my cycling 26g. I've been using SeaChem's Stability as part of the cycling. I'm also seening a small build-up of foam bubbles. Is it this that I'm seeing? If so, need I be concerned about it? I've added extra flow to the surface via a Korilia 250, yet the film still remains.
The oily substance is, I beleive, proteins and other waste. Most likely building up from the polution caused by the cycle your tank is going through and the dead organics in the dry rock cycling in your tank. The bubbles are a sighn of a heavy build up of these broken down organics.
With water changes and carbon, this will eventually go away. A surface skimmer could help very much. A protein skimmer is the best option against the oily look at the waters surface.
The oily film is very common in a non skimmer tank. If you notice the film not receading, make sure you give the water surface good agitation for gas exchange.
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