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so i have placed my 2 #4 in the top left/right corners pointing to center front of tank and the flow has carved a huge crater in my sand. I have about 2/3 inches of sand and it is now down to the bare glass in the center. - would it be better for me to put them on front of tank pointing back and rock, or just place them like center left/right with a more upward pointing flow!
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