I agree with Big-G.
The thing with feeding (excluding fry which pretty much have to be fed), if your water quality is good and the fish are acting fine, it should be good to feed. We want to feed the fish to help them stay strong and unstressed, and I agree that it isn't a good time to change foods.
One exception for me might be if water quality is not good however (e.g., constant presence of ammonia or nitrite.) That plus the ich is not a good condition, and since the ich is a temporarily uncontrollable problem, feeding imo should be slowed down or stopped to help improve the water quality. (Changing the water can obviously help with that as well, and is probably what should be done, but again, isn't always possible, Reducing feeding is easy to do.)
Fish behavior like rapid gill movements or constant dashes to the surface can be indicators of difficulty breathing (due to low oxygen or ich infection of the gills or both.) In that case, feeding can compound the problem by temporarily increasing ammonia in the tank, so imo feeding should be reduced, until aeration or time reduces the behavior.
The thing with feeding (excluding fry which pretty much have to be fed), if your water quality is good and the fish are acting fine, it should be good to feed. We want to feed the fish to help them stay strong and unstressed, and I agree that it isn't a good time to change foods.
One exception for me might be if water quality is not good however (e.g., constant presence of ammonia or nitrite.) That plus the ich is not a good condition, and since the ich is a temporarily uncontrollable problem, feeding imo should be slowed down or stopped to help improve the water quality. (Changing the water can obviously help with that as well, and is probably what should be done, but again, isn't always possible, Reducing feeding is easy to do.)
Fish behavior like rapid gill movements or constant dashes to the surface can be indicators of difficulty breathing (due to low oxygen or ich infection of the gills or both.) In that case, feeding can compound the problem by temporarily increasing ammonia in the tank, so imo feeding should be reduced, until aeration or time reduces the behavior.
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