I just tried him with 4. He was doing pretty well and then spat out a small piece. I guess it was too much for his little tummy to handle. I will do a 50% water change tomorrow and then every other day this week 25%.
3-4 will be fine then, whatever you think he will be okay with. Some bloat is fine, I just mean you don't want him looking like he'll pop a seam from soooo much food he can't even handle! You want a nice round tummy, not completely flat