Diy Frames Fish Tank! Please Like The Tip If You Found It Useful! by Diy Frames Fish Tank! Please Like The Tip If You Found It Useful!Materials: Rectangular Tank, Picture Frame, Mounting Tape, Aquarium Rocks, Aquarium Decor. Remove the back of your frame and apply your mounting tape. Tip: Your picture frame should be the same size as your tank. A rectangular vase that you find at your local craft or floral store will make a great tank. Just be sure it’s at lease 2 -3 inches deep to give your fish wiggle room. Mount the frame to your tank.Decorate the inside of your tank with rocks, greenery or whatever aquatic decor that catches your eye. Remember this is the “picture” that will be visible in your frame so have fun with it!