he is in half of a 10g with no other fish, although this weekend i am getting a half moon for the other side(which I am really excited about!). will this stress him out? temp is 70 degrees. I'm not sure how often I change the water......I just did a 20% water change, I also rearranged the tank for the new half moon. hes got a filter in his half, and since the divider doesn't let much water through, i plan to switch witch side the filter is on every so often.