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Old 08-30-2013, 10:04 AM   #1
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powerhead placement and dead spots?

so i have rearranged the live rocks and played around with the placement of the powerheads (Koralia 425 and Aqua clear). Just recently i have been through a diatom breakout and slowly but surely it's going away. what i'm noticing now is that there's brown spots on the corners of the tank. are those dead spots due to a good water flow? or dead diatoms? can someone recommend a way of getting rid of them or a better placements of the powerheads if the brown stuffs are the results of the lack of water flow?

Placements: Koralia is on the right rear corner slightly angled downward
Aquaclear is on the left center with Hydor FLOW deflector
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Old 08-30-2013, 03:30 PM   #2
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I'm in the "high flow" camp and like at least 20 x tank volume. I am currently running at about 28 x and want it a little higher like 35 x.

That could be build up due to a dead spot but I think diatoms can form even in higher flow areas. Now if you see detritus or uneaten food collecting in an area it is definitely a dead spot and you will want to adjust.
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Old 08-30-2013, 11:35 PM   #3
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I'm in the "high flow" camp and like at least 20 x tank volume. I am currently running at about 28 x and want it a little higher like 35 x.

That could be build up due to a dead spot but I think diatoms can form even in higher flow areas. Now if you see detritus or uneaten food collecting in an area it is definitely a dead spot and you will want to adjust.
well, the thing is that i don't have many things in the tank. two hermit crabs one pistol shrimp, and one goby. i don't overfeed. but i have no idea what's causing the sand on the corners to "turn"/look brown. it's definitely not diatom or algae. it looks fuzzy but not any sort of hair algae.
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Old 08-31-2013, 01:00 PM   #4
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Try aiming the power heads at each other the flows crashing into one another will give you a good random flow.
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Old 08-31-2013, 07:26 PM   #5
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Try aiming the power heads at each other the flows crashing into one another will give you a good random flow.
won't that cancel the flow from both powerhead and create less movement of water?
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Old 08-31-2013, 07:52 PM   #6
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You would think so but it dont, it creates a random flow through out the tank
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Old 08-31-2013, 08:32 PM   #7
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I position my powerheads slightly upwards to get surface agitation and towards the front glass. The two flows meet and crash causing chaotic flow.
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Old 08-31-2013, 09:58 PM   #8
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oh really? i can try to reposition the powerhead on each side a little bit. but do you guys think i have enough flow? one is koralia 425 and the other one is AquaClear 50
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Old 09-01-2013, 07:42 AM   #9
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I'd take that AC 50 out and add a 750 or at least a 450 to that side
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Old 09-01-2013, 11:57 AM   #10
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I'd take that AC 50 out and add a 750 or at least a 450 to that side
well, the reason why the AC is there is because i have a FLO deflector attached to it to create a "random" flow.
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