[Pumilo]

I don't think this would cause the outright death, but is a nutrition concern. Read the ingredients on a package of high quality fish flake compared to the ingredients in tad bites. The fish flake has more, high quality seafoods and less fillers. Also, spirulina is rather old school for a stand alone feed. I mix it into my feed, but not rely on it as a stand alone.
Consider Ocean Nutrition Formula One flakes, with some added Cyclop-Eeze freeze dried. A little spirulina mixed in wouldn't hurt but is probably not necessary.