Originally Posted by dramaqueen
Algae growing in a tank doesn't mean it's cycled. The benificiial bacteria doesn't grow in the water, it's on the surfaces of the tank, plants gravel and decorations.So, unless you got gravel from an established tank, I'd say that it's probably not cycled.
+1 with DQ...
a cycle needs to build beneficial bacteria on all that parts of your tank DQ mentioned, and on, mostly importantly, your filter media.
Think of it this way, if you do the weekly 25% weekly water change, if
bacteria grew in your water, it would be gone with 4 weeks. your want would
be having to build new bacteria colonies constantly
. It's for this reason that bacteria needs to seed itself on the decorations and gravel in your tank. Because when you do your weekly water change, you're not losing that bacteria.
Algae in a tank does not = a suitably established aquarium.