Flow rate and need of powerhead?

Pennyworth

Wonderpus
Registered
Joined
Dec 13, 2013
Messages
192
Thanks, I just bought 2 to play with and see what they are like. Ideally would like to make it so all detritus can blow into one area for easy cleaning, as I have read some people doing.

Dwhatley, what size powerheads in what size tanks do you have?
 

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,988
I keep about 8 active tanks (give or take one over time) and then a few miscellaneous environments (7 at the moment) for feeders and just playing around :roll: I keep thee tanks for octopuses but usually only two are occupied at a time. My two primary octo tanks are roughly 60-65 gallons with 35 gallon sumps and I have a smaller 37 gallon octopus environment with a 15 gallon sump for small animals or for growing out very young animals (currently housing my cuttlefish hatchlings in a breeder net). Then there is my first octo tank that is now owned by a lobster and a couple of pipefish (new by-catch acquisition from the guy currently supplying my shrimp for the baby cuttlefish) and a 4' tall but only 16" diameter hex that currently has one Clarkie clown and a huge condylactis anemone, a nano with a couple of hard corals, a 140 ish pent that will house the cuttles when they are big enough and a bio-orb that just has small shrimp. Soooo, I am not sure what flow rates I have in which tanks. Typically I will pull the existing pumps and match (or upgrade if I think the flow needs changing) them when one dies.

I have a gallery of my octos (needs updating) and my octo tank buildouts are linked in the buildouts thread in Tank Talk. The tank buildouts, however, do not include flow rates or hardware specifications, an oversight on my part I am afraid (and much has likely changed over time).
 

Pennyworth

Wonderpus
Registered
Joined
Dec 13, 2013
Messages
192
I need to look at your gallery in more detail, very curious :smile:

I added 1 800gph powerhead and another 650gph powerhead. The 800gph one was $14, the small is a Koralia and was almost $40...I'm not sure what the advantages are over the cheaper one, and might send it back and replace it with another cheaper one.

Is there any benefit to the more expensive one?

I'm wondering if this is actually too much flow. With both of those powerheads and my return pump I estimate the flow is about 30x. Is that too much for an Octopus?

I also have no idea how to octopus proof these things. I can certainly proof it so they can't get to the impeller, but how can I stop them from pulling the powerheads down, since they are held in place by magnets?
 

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,988
I have not tried (nor were they available when I bought my Koralias) the generic, low cost wave makers/water movers. If you can't return the Koralia or decide to keep it, you might report on how well one holds up against the other vs cost (ie you would expect the name brand to last at least 3 times as long as the branded).

I use a zippered mesh media bag (link for size and style but not as a recommendation as I have not used this vendor) over my Koralias. It is easy to remove and clean and can be zipped so that just the wire is exposed.
 

Pennyworth

Wonderpus
Registered
Joined
Dec 13, 2013
Messages
192
I will keep an eye on both and see if I notice a difference. The cheaper one was actually easier to mount and I thought nicer to use, which was interesting.

I get how to protect from the impeller, but how do you stop the octopus from moving the powerhead around or tearing it off the glass? I would think it is easily strong enough to do so, since it's just a magnet.
 

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,988
The Koralia magnets are very strong and where I use them I have not had an octo relocation problem. However, I mostly use the stand only and wedge the unit in the live rock.
 

Pennyworth

Wonderpus
Registered
Joined
Dec 13, 2013
Messages
192
My powerheads will be situated on the glass, hoping the magnets are indeed strong enough..so far they have survived starfish and large snails hanging off them. Is there any need to secure the powercord it is attached to? I have one running across the tank, and don't want the octopus to pull it and maybe pull out a cord or something...
 

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,988
The magnets work very well and you should not have an issue (this assumes a Koralia, but I think most brands have strong magnets). Cords are a PITA in general but the only thing I have had as a problem is pencil urchins chewing on them (a likely cause of some of the electrical shorts you will see mentioned in reef forums). Koralias used to come with a funny spiral wrap with no clear usage. It is used to put around the part of the cord that is in the water for this purpose. I am not sure if they still provide it and most people don't have issues. Keeping the cord free of algae will help with the clean up crew potential problems but I have never had an octopus interfere with the cord.
 

Top