Hello,
I have a 75 gallon with two hob whisper 2 (200 GPH each max.), 660 (170 GPH) and 550 (145 GPH) powerheads with undergravel filter. I calculated about 9.5 water changes per hour for the tank. Is this about average for a filtration rate? What direction should the powerhead outlets point for circulation proper circulation (up, down, sideways)?
Thanks, sunrise
I have a 75 gallon with two hob whisper 2 (200 GPH each max.), 660 (170 GPH) and 550 (145 GPH) powerheads with undergravel filter. I calculated about 9.5 water changes per hour for the tank. Is this about average for a filtration rate? What direction should the powerhead outlets point for circulation proper circulation (up, down, sideways)?
Thanks, sunrise
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