Found a comparison of the two products.... absolutely go ahead and use the fresh water variety. I apologize for not asking for particulars in the first place, instead of just handing down a verdict.
New Era Mini Marine Grazer
Ingredients: Fish Meal, Dried Seaweed Meal, Cornstarch, Fish Oil, Krill, Squid, Mussel, Shrimp, Choline Chloride, Vitamin A Acetate, Cholecalciferol, dl-Alpha-Tocoperol Acetate, Calcium L-Ascorbyl-2-Monophosphate, Zinc Sulfate, Manganese Sulfate, Nicotinamide, Inositol, Copper Sulfate, d-Calcium Pantothenate, Ferrous Sulfate, Riboflavin, Calcium Iodate Thiamine Mononitrate, Pyridoxine Hydrochloride, Menadione Sodium Bisulfite Complex, Folic Acid, and Vitamin B12 Supplement, Biotin.
Guaranteed Analysis
Crude Protein 35.0% min
Crude Fat 11.0% min
Crude Fiber 2.0% max
Moisture 23.0% max
Ash 18.0% max
Vitamin A 15,000 IU/kg min
Vitamin D3 2,000 IU/kg min
Vitamin E 200 IU/kg min
New Era Mini Tropical Grazer
Ingredients: Fish Meal, Dried Seaweed Meal, Cornstarch, Fish Oil, Krill, Squid, Mussel, Shrimp, Choline Chloride, Canthaxanthin, Vitamin A Acetate, Cholecalciferol, dl-Alpha-Tocopherol, Potassium Chloride, Sodium Chloride, Dicalcium Phosphate, Magnesium Oxide, Calcium L-Ascorbyl-2-Monophosphate, Zinc Sulfate, Manganese Sulfate, Ferrous Sulfate, d-Calcium Pantothenate, Riboflavin, Thiamine Mononitrate, Pyridoxine Hydrochloride, Menadione Sodium Bisulfite Complex, Calcium Iodate, Sodium Molybdate, Folic Acid, Copper Sulfate, Sodium Selenate, and Vitamin B12 Supplement, Biotin.
Guaranteed Analysis
Crude Protein 35.0% min
Crude Fat 11.0% min
Crude Fiber 2.0% max
Moisture 23.0% max
Ash 18.0% max
Vitamin A 15,000 IU/kg min
Vitamin D3 2,000 IU/kg min
Vitamin E 200 IU/kg min