You are quite new to the hobby D-Q7 so you will find it to be a very steep learning curve at this point I'm afraid. Let me comment on some of your information...
That would make your pond less than 1000 liters at the maximum. You will find the fish are going to outgrow this in very short order (6 months to a year). As a result you will find that nitrites will start to appear and even ammonia can become a problem.
Water quality isn't related to how clear the water is. Your water can be very clear and still have many problems. The only way to know for sure is to buy some test kits and check for ammonia, nitrites, KH and pH. In system as small as yours I would recommend frquent water changes as well (3X 20% a week). Watch out if you have chlorine or chloramines in the water. Do you have a bottom drain? If not you should consider one when it comes time to rebuild the pond. Any "mud" on the bottom should be avoided.
You should feed your fish with the best feed you can get your hands on. With tosai look for a high protein content and NO protein of fat from mammals, just fish, mollusk, insect, crustacean and plant protein. I would avoid silkworm at this stage as well as feed with color enhancers. Growth enhancers? What does he mean by that?.
Just use a good quality small pellet. I can't recommend a brand as I have no idea what is available in your area. Perhaps Kiki might know?
B.Scott