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dragonfisher33 08-30-2013 09:04 AM

powerhead placement and dead spots?
 
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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

erichm20 08-30-2013 02:30 PM

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.

dragonfisher33 08-30-2013 10:35 PM

Quote:

Originally Posted by erichm20 (Post 2633009)
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.

Grizz 08-31-2013 12:00 PM

Try aiming the power heads at each other the flows crashing into one another will give you a good random flow.

dragonfisher33 08-31-2013 06:26 PM

Quote:

Originally Posted by Grizz (Post 2634142)
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?

Grizz 08-31-2013 06:52 PM

You would think so but it dont, it creates a random flow through out the tank

carey 08-31-2013 07:32 PM

I position my powerheads slightly upwards to get surface agitation and towards the front glass. The two flows meet and crash causing chaotic flow. :-)

dragonfisher33 08-31-2013 08:58 PM

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

Grizz 09-01-2013 06:42 AM

I'd take that AC 50 out and add a 750 or at least a 450 to that side

dragonfisher33 09-01-2013 10:57 AM

Quote:

Originally Posted by Grizz (Post 2635157)
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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