can........ wont die geh.... but just that they grow very slowly...... you want them to grow fast right?

i see, in that case, you may want to try doing water change like every week? see if it improves? or change a better filtration system? water quality is very important for fishes, they may be able to survive, but you want them to thrive right?

regarding the feeding pattern, i dont see any issue with feeding 3 times a week.

if you use tap water, then you should add a bit. for pond is too big to have reserve water. we normally have a reserve tank, and i dont put it. just run it with water pump.

why not. best of both worlds. if you like it. i'd say, go ahead with it