Octo Pen


The ORIGINAL mushroom box!


The Octo Pen™ is great for mushrooms and other corals you want to isolate from the rest of your tank. Fabricated out of 1/8″ acrylic, available in clear or black. The Octo Pen™ sits on the bottom of your tank and the 1/4″ slots on all four sides allow for flow from multiple angles.

Size shown is 7″ x 7″ x 4″, but I can custom make them any size!

My products are made to order, custom! Please allow up to 10 business days for fabrication time for most products. Because my products are made to order, fulfillment time can rarely take longer. Full custom orders can take up to four weeks to complete. Please let me know ahead of time if this may be an issue. Shipping prices listed are to the contiguous U.S. Please contact me if you live elsewhere and want a shipping quote. Because my products are handmade and/or hand assembled, there may be small irregularities (fingerprints, marring, hair, etc) which will not effect the performance of your product.


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