Thanks for your question. Our small Glass on teak holds 1 liter on average. If you have a specific volume requirement please let us know - we can provide photos with specific volumes if you'd like.

A 3 gallon tank is unarguably suitable. Our "Large Glass on Teak" ($235) might accommodate this volume. Would you like for us to take volumes on some our our "Large Glass on Teak" vessels we have in stock? I'll share photography with you as well. Additionally, if you are interested in ordering from Houzz, there is a coupon code that will save you $20 if you purchase before May 11th. The code is: "SketchUp". Use it at checkout.

I'd love to see a photo.

Thank you,

Bill Bastian

We will be in touch. If you have an email address it will be easier to share photography. Otherwise we will use the Houzz messaging system.

RosebudandBill@aol.com