Robbie Refurb here. I am at it again and today I hve Chaeto macro algae for your saltwater tank. This is a 20 g portion of a dense brick grown in my refugium. Brick is 3"x3"x2" thick and weighs 40g, this is for half a brick. Chateo is great for your saltwater tank as it eats up those baddie, like NO3 and NO2. It grows with very little and grows fast. Message me for any questions.