I would recommend replacing that 105 with a 305... a 3' tank, around 30-40 gallons or so? A 105 would be for a 10-15 gallon tank.
But, spraybars are easy. 1/2" pvc
with an end cap and holes every 3/4", with a few suction cups. I would put it on top instead of the bottom though... surface agitation is helpful... more helpful than having it push debris around on the bottom.
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