Overflow types

Discussion in 'Beginner Discussions' started by lIghty, 30 Dec 2007.

  1. lIghty

    lIghty

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    Hi, what exactly is a c2c overflow, is it a tank with 2 overflows in each corner and does it 'skim' the length of the tank??? what other types of overflows are there?
     
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  3. Marinemagic

    Marinemagic Member

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    hi there, have a look at my tank setup, I have got a c2c with one overflow box, but you can have it with two overflows. The most important thing about it is that the lenght of the overflow must be 100% level.
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  4. lIghty

    lIghty Thread Starter

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    Marinemagic, I see what you mean, 1. Does it help to skim a bigger area? 2, Is there not a risk of fish jumping over into it?
     
  5. Kanga

    Kanga Retired Moderator MASA Contributor

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    Certaily is a benefit in having a larger surface skimmimg area.

    You can use eggcrate or an overflow comb to stop fish from going over
     
  6. Marinemagic

    Marinemagic Member

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    Yes there is a risk of fish taking a swim, but I will be putting up egg crate to stop them from doing that, as well as the snails crawling over. The experts say that the larger the surface skimming the better your skimmer will work, I will wait and see as my other tank does not have this setup, but is alot smaller.
     
  7. lIghty

    lIghty Thread Starter

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    Marinemagic, I see you got pipes in you over flow, 2x drain and 2x return??

    I'm busy designing my new 5ft and was thinking of putting 3 pipes in, 1x drain 1x return & 1x for electrical cables so they can't be seen running up behind the tank,(making things neater)

    any advise??????
     
  8. Marinemagic

    Marinemagic Member

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    yes I have seen this done before, just remember the pipe for electrics has to be big enough to fit the plug thru otherwise you will have to cut the plug off and then you will lose the guaranteeon new pumps. Also most pumps do not have long enough electric cords so you will have to cut and lengthen them. Also if you go for one overflow box you will still have to run a cord to the opposite side.
     
  9. lIghty

    lIghty Thread Starter

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    Thanks for you input. Was thinking of just running main feed lines up and have a insulated "DB" in the canopy, therefore the lights and pump cables would just run in the canopy. You think this is good?
     
  10. phat

    phat

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    agreed but what has been left out here is that it depends on the amount of flow going over your overflow, C2C allows for alot more turnover through your sump if you have plumbing that can handle,

    look at it like this, you are essentially wanting to skim the water just below your water surface...

    take a weir 10cm long and pump 1000l of water per hour over it
    then take a weir 100cm long and pump 1000l of per hour over it

    what difference are you gonna get?

    the height of the water going over the weir not so, (have never measured the difference) lets say on 10cm weir you get 1cm of water height flowing over it

    and on the 100cm weir you 0.5cm water height flowing over it

    which is giving your skimmer more surface water?
     
  11. DragonReef

    DragonReef

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    Mmm Phat, sort of but not really.

    Your sump turnover will be determined by the size of your return pump and the size of your drain pipe. A 12000L an hour return pump draining through 2 x 50mm pipes and you will be turning over a whack load of water through your sump. But doing this doesn't necessarily mean that you are exporting that much more waste to your sump / skimmer.

    Your skimmer will only be as efficient as the amount of DOC's that you are able to export from your system. By having a single corner overflow, it minimises your chances of being able to get the waste out of your tank. Powerheads / closed loops etc will push waste away from the overflow most times, or you find that you are setting flow up to be able to utilise the overflow and compromise coral health.

    With a coast to coast you are virtually skimming the entire surface of the tank, which greatly improves the chances of getting the protein waste out of the tank and into the sump where your skimmer can pick it up.
     
  12. phat

    phat

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    all of that agreed

    except that if you are not getting your DOC's to the skimmer cause you have a really large overflow and minimal water trickling over it (guys always suggest 10X tank volume for turn over for sump flow) at 10X tank volume it renders C2C pointless as much isn't getting surface skimmed so your skimmer is not getting them DOC's, the higher your water height over your weir depicts hw much you really can get to your skimmer, ever heard of back pressure?
     
  13. viper357

    viper357 Admin MASA Contributor

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    Only in australia :p
     
  14. phat

    phat

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    agreed i am saying that to large of an over flow can also be as bad as to small

    well em anthony thats why plan ahead;)

    flow that comprimises coral heath?


    agreed but pretty pointless if you dont have enough flow going over your C2C to surface skim properly
     
  15. phat

    phat

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    and do you like it?
     
  16. Mekaeel

    Mekaeel Moderator MASA Contributor

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    and also make sure that you tank is level with a C2C
     
  17. DragonReef

    DragonReef

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    Back pressure on what ?

    Setting up flow in your tank to direct water to your overflow as a priority, as opposed to using your power heads to direct waste to and from coral. This will compromise health.

    It goes without saying that regardless of the type of overflow you design, your drain plumbing and return pump need to be able to cope with it.
     
  18. phat

    phat

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    you missed the boat and surface skimming(which is what overflows play a bbig role in is whats this is about which also plumbing has alot to do with:p) and go do a search on google for back pressure
     
  19. Kanga

    Kanga Retired Moderator MASA Contributor

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    The oil film/scumline that you sometimes see on the surface of some tanks is the DOC's. the bigger the wier/overflow the more of these DOC's you will be sending to you skimmer more often. Clearly this is a good thing.

    Phat as for back pressure, between the overflow and skimmer the only backpressure you will get is from too many bends or valves in your piping, however if your overflow copes with the water volume, then it will have no effect on your surface skimming, if it doesn't, get a mop ready. :D

    HTH
     
  20. Ridwaan

    Ridwaan

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    When i had a normal overflow,i always experienced this oily dusty layer on the surface of the water and when i changed to c2c i never experienced this again,also,my skimmer performed better.
     
  21. Kanga

    Kanga Retired Moderator MASA Contributor

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    And that sir is the bottom line, would you not want the same for your tank??, thanks Ridwaan
     
    Last edited: 31 Dec 2007
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