Looking good, BG. Either plain water or a light nute solution would be fine at this point. As I mentioned earlier, I like to alternate between water and full-strength feedings, but since you're doing light feedings every time, I'm tempted to say, just continue what you're doing....since she seems to like it. The chance of salt buildup will be reduced in your case, since you haven't been using full-strength nute solutions up to this point. Of course, if you see any symptoms of salt-buildup/nute lockout at a later date, that would be the time to do a flush with just water. Otherwise, "if it ain't broke, don't fix it."