Yup. Though I age my water to avoid potentially dangerous bubbles - so I cup Sid, put the aged, conditioned water in the tank and then raise the tank temp back up. Then float Sid half an hour or so, adding a little new water to the cup every now and then. The cup water doesn't get too cold, as it's summer here. In winter, I might get a small heat pad to set the cup on. He gets way less stressed when I do changes this way - even likes the cup, as he gets a snack during and after the water change, so he knows the cup means food, lol.Day 8 (bit of a summary): when I put in the new water he acted a little weird, mostly hid in his log. I think it may have been because the new water wasn't the same temp as the original....should I be raising the temp of the new water with the heater/then adding it to his tank?
Bettas don't like sudden changes, particularly of temperature, it can put them into shock, so however you do your routine changes, make sure the water is an even temp for him all through it.
I love the pic of Spike peeking out of his log - would it be okay if I attempted to draw him from that picture?