What about head on prawns I can get them for $2.00 lb and I shell them myself so they don't puncture or hurt the stomach. Tilapia is a good idea also I'll try that usually I like to make what I call a chum bucket of several different varieties to keep it new and fresh everyday. Thanksyou are askign a really fine line qustion here. The reason being, dog food would "technically" work as food and be fairly cheap/inexpensive, but not of the proper quality. Most quality foods will run you a little bit, even a bag of frozen tilapia filet at your local walmart isnt cheap. i find its easier on the wallet, to buy in bulk for several different foods, i use tilapia, massivore, algea wafers, cichlid gold and staple, along with frozen krill, beef heart. this way you vary thier diet regularly, feedign different food eevry day, and dotn use up all of just oen food at a time. IMO this is the best method.
When feeding ask yourself this question. Would you want to eat the same thing every day for every meal?
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