One of three ways:
1) Drill holes in the glass - Hardest Way!
2) Drill holes in the plastic strip in the back of the tank (assuming you have one) - Easy Way
3) What I wish I had done! Let the tubing run thru the inside of the setup and just cover up the tubing by Ivey or some bushy plant of some sort. You will have a much easier time of "aiming" it this way. I may go back soon and re-do mine. I chose way #2.
By the way, let me know if the "silent pump" is actually silent on yours. Mine is noisy as hell and for that reason has been put into retirement for a while. I will switch my pump out if this is the case.
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Cliff
0.2.1 Sipiwlini Tinc's