I have 3 tems and 2 monos in a barebottom, and I want them to color or darken in color. My friend and I bought the tems together and his tems are dark green with spots all over the place. Mine however are light green with about 50% less spots than his. The tank conditions are exactly the same, temp, barebottom, food, water conditioner. We basically have the same tank. Please advise. Thanks.