I have a 12g Nanocube, so it just has the built in pump. It seems to do a decent job with the water flow. I've seen a few Nanos (at my LFS
) that have been up and running there for a while, and don't seem to have the cynao. Of course, they could just be treating I suppose, couldn't they!?
When I add buffers as needed when my kDH gets low, I can see the liquid of the "part B" buffer (as it becomes white when hitting the water) encircle the entire tank relatively quickly, kind of illustrating the flow. What's a general guideline for water flow? Is there a standard formula to figure out what you should have? Oh, and the tank has been up and running since mid-July, so it's relatively new, if that makes a difference.