Just put together a 33 gallon tank recently. It's been up and running for about 3 weeks now. It has only a single chunk of live rock, plus a small bag of live sand. I haven't tested the levels yet, but will start to soon.
A couple questions. I bought a used protein skimmer from my local pet store. And it is different from the one pictured on the cover, and also the one inside the instructions. What appears to be missing on my model, is a small venturi hole in between the intake and outtake chambers. The instructions state that regardless of the type of skimming (wet or dry) there should be micro bubbles in the spout that leads to the detritus container. There aren't any on mine...no bubbles at all. I am not sure if this is a result of the lack of debris and such in a new tank, or if in fact there was a "reason" this thing was priced for quick sale. It almost seems like someone did a switcheroo.
So question #1 is...do I need to invest in a new skimmer? If so, any recommendations for one that is for a 33 gallon tank? Given my setup, I'd prefer a hang-on, unless it's a small internal.
Second question. I have some medium green, bright green, and small patches of brown algae starting on my base rock. Any idea what the greens are? I know the brown should go away from what I remember of my last tank...but are the greens a type of coraline algae, or just a type that appears in new tanks then go away?
Thanks for the insight in advance!