Dainichi foods do have an appropriate amount of fish, krill & plankton protein to satisfy a carnivorous species such as trets...I feed my troph's veggie fx & omega one kelp pellets (also containing halibut & krill protein) and also have 3 malawi blue dolphins in the tank (also carnivores + my wife's fav fish)...the dolphins are doing great for sure, but I am not sure pure spirulina flakes will be sufficient for your trets...time will tell I suppose...hopefully their need for protein won't turn them into tail ripping, flesh stripping maniacs in your vegan tank...