My oscars are 3 yrs old and are of good size now. I generally feed them dry pellets. Those 1/4" x 1/4" ones. I buy them as large cichlid pellets. How many of these does a fish of this age need? Their diet is supplimented by the odd insect of a night as there tank is outside on a verandah & the light attracts a few in as i live in the tropics. The info I have got from the array of local shops is one a day to as much as they can eat. I generally give them about 5-6 a day. Need some pro advice