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I am short one bag of gravel from Petco, but I wanted to get the tank cycling asap.
first I made the PVC Pipe with 1/2 Inch PVC with a 1/2 to 3/4 thread adaptor attached to a nylon 90 degree barb elbow to 3/4 inch threads. The interior of the pipe is drilled with 1/8" drill bit.
The interior is filled with SeaChem Matrix
pvc isnt straight, oops!
Next step is make mountains to the top of the pvc pipe. That's what 20 pounds of gravel looks like
shape the matrix using gravel in the center
All filled up!