plantass - You're looking at it the wrong way. I know what you're asking, but it's not the right question. With plants, if they look good, they feel good. A naturally slow-growing plant, if healthy, will still look good and look healthy without growing much. You can just tell. Spots, discolorations, rotten patches, death of new leaves, new leaves pale, algae... these are all signs of an unhealthy plant, whether growing slow or fast. In fact, a plant can grow fast, but still show a nutrient deficiency (ie. new leaves growing in yellow or crinkled - is that a word?) Don't expect fast growth from Anubias. Other than that, you should see growth in most common plants if you have the most basic necessities.