Süsswassertang

1 portion is roughly a golf ball size.
 
Süsswassertang  is an incredibly easy plant, shrimp love it and it adds tons of surface area for grazing. It is able to grow in almost any water condition, but prefers soft(ish), clean water and any lighting. It will help reduce nitrates in your aquarium, making it possible to do less frequent water changes. You can attach it to rocks or wood or just let it float around and it will stick to something naturally.