Subwassertang fresh water seaweed (fern) 2 oz deli cup full

Subwassertang is a very easy aquatic plant to grow, requiring little light to lots of light and all kinds of water conditions.  Can be attached to a rock or driftwood or left to just float in the tank/.  We use this to help clear the water of nitrates in our betta bowls    It is a fern? but a strange one.  Interesting aquarium addition .  No need for CO2