Thera+A enhanced diet takes our nutrient-dense, guaranteed-results recipe for the Spectrum Nutrition Formula and combines it with extra garlic ­— which has been shown to increase parasite resistance and the immune system in tropical fish. Garlic is also a great attractant. Beyond this, added Omega-3 and higher protein ensures that even if your stressed or newly acquired fish don’t have a full appetite, they get what they need. Non-medicated.