What are Saltwater Plants good for? What are Saltwater Plants good For? 1. Macroalgae is great for naturally reducing algae - The MACRO out-competes the MICRO and reduces the food source - in essence starving the MICRO algae. 2. Saltwater Plants are great food source for fish. Fish love to much on Algae like ULVA aka Sea Lettuce or Red Gracilaria 3. Macroalgae is a beautiful addition to the tank. Aesthetically it is very pretty and makes the reef tank look like a natural chunk of reef with real plants! 4. Saltwater Plants provide natural homes for small crustaceans and other animals like amphipods and copepods. BTW - Pods are on sale for a BUCK!!