O.S.I. Spirulina Flakes are not only an excellent natural color enhancer, but the algae, spirulina, also stimulates your fish's immune system to attack gram-negative bacteria. Gram-negative bacteria are known to cause a variety of diseases in fish.https://www.aquaristikshop.com/aquaristic/O-S-I-Spirulina-Flake/675040/
- Asier O. wrote about O.S.I. Spirulina Flake in 2017:
The best spirulina I've used with my cychlids, but it's difficult to find.