Nursery Tank

This tank will be used to collect baby medusae released from polyps and to grow them out to certain size (3~4 mm).

We collect baby medusae by leaving colonies in this tank up to 2 nights. This is because…
  • Polyps eat quicker than baby medusae. If there are babies and polyps in the same small tanks, babies can never eat their first food.
  • Leftover of the food (dead artemia) will stay inside and attach to the polyps, which accelerate algae growth.

You may want to collect babies for more than 2 days, if you couldn't get enough. In this case, try either of these two.
  • Simply set up another nursery tank and transfer polyps to it.
  • Take out all babies using a pasteur pipette and grow them on a dish at least for a few days. Clean the nursery tank and re-install the sea water.


Setting up

  1. Connect the aeration tube.
  2. Fill the tank with sea water to 90~95%.
  3. Install colony plates
  4. Fill the tank to 100% (to maximize the water circulation).
  5. Adjust the aeration speed.
  6. 2 Days later, take out the polyp plates and fill up with sea water

5. is of particular importance. See below the criteria


  • (first 3~4 days or for baby medusae up to 2~3 mm): Relatively strong. Some bubbles will travel 10~15 cm on the surface before they disappear. See right tank of the photo above.
  • (Until 7~9 days or for baby medusae up to 3~ 4 mm): Relatively weak. Bubbles do not travel and disappear at the edge of the tank. See left tank of the photo above.

The speed has to be strong enough not to let the baby medusae staying on the bottom but not too strong to avoid the damage. Usually choose minimum speed enough to rotate baby medusae.

We normally keep baby medusae up to 3~4 mm in diameter in this tank. Once babies are grown to this size, any speed of bubbles will be harmful. It is then necessary to transfer them to Kreisel tank.

Nursery tank (dram) model 2010

φ250 (240) x 80
Target of culture
Collecting baby medusae and grow-out (up to 3~4 mm).
Nursely for very young medusae.