When my partner changes the water ,Oscar starts becoming very fustrated over this action,he starts swiming around very fast on the fish tank and also tryes to hide himself between the tree leaves,His gills start moving as a signe of fear or fustration i assume,he really does not appreciate the idea of a water change,we havent tryed any of the conditioners yet for Oscar ,will defenately try one soon and see how are they going to treat him,and we will defenately try new fish foods just for Oscar to explore a bit and expirience a change,if he is happy with the idea than me and my partner will carry on with this idea