however... there are very few spirulina foods which are of a decent quality... imo, you'd be better off with one of the premium foods by hikari, or NSL, which has a good reputation but i've yet to try... (it's on order)
personaly i try my best to feed them as much natural food as possible mimicking what theyd eat in their natural enviroment as i genuinely beleive its better for your fish dietry requirements and health. Though when supplementing this with pellets i use Tetra Prime complete food its a high protein[50%] pellet formula.