Nice...!!!

I have two adorable little goldfishes, and I'm dying to find the best recipe for making gel food for them. But now I feel like"I finally found it" :D.The only problem I'm always having with homemade gel food is that," I don't know how to preserve it properly". last time I made one I could only keep it for a couple of days in refrigerator, and had to give most of it away because it was rotten. would you please tell me how do you preserve gel food?

PS: The gelatin I added last time wasn't that much to make hard cubes out of it. ( like the image you uploaded at the first of the post). I would like to know if this is the point that I was missing.