ok well since i added these 250 watt MH it starting to create bubbles on top of the rocks again, like it did when it was cycling, is this good, it seems to be producing a dark brown type algae along with these bubbles...is this a sign of re-cycling or is it just growth from algae, i thought it was part of the nitrate process(these bubbles)....should i do more water changes or no due to too many nutrients, if these are nitrate bubbles then will it spike?