+ Reply to Thread
Page 2 of 2 FirstFirst 12
Results 11 to 15 of 15

Thread: cant get nitrates down

  1. #11
    Banned
    Join Date
    Aug 2010
    Location
    USA
    Posts
    2,710
    a 6" wide screen should have about 200-250 GPH over it. If you pump is in the neighborhood of 800 GPH, and then add in loss (which might be dependent also on return pipe size - the larger the less loss, the smaller the greater loss) you could be more like 400 GPH. When you say "main pipe of a twin overflow" are you talking about a primary + emergency type of setup? So this is on the primary which gets most or all of the flow?

  2. #12

    Join Date
    Jul 2012
    Location
    UK
    Posts
    14
    Yes its 32mm primary drain

  3. #13
    Banned
    Join Date
    Aug 2010
    Location
    USA
    Posts
    2,710
    Ok. I think based on that, it doesn't sound like a flow issue. Add the second light and extend the photoperiod a little. With those multichips you have to be careful about over exposure, so bump it up to 15 or 16 hrs/day and watch for signs of burning.

    Out of curiosity, when you clean the screen, is there a bare/white spot right in front of the LED? Or is it pretty much filled in everywhere?

  4. #14

    Join Date
    Jul 2012
    Location
    UK
    Posts
    14
    No white spot or burning, just lush green gha all over the screen, anyways thank you verymuch for the advise

  5. #15
    Banned
    Join Date
    Aug 2010
    Location
    USA
    Posts
    2,710
    Good. Bump up to 16 hours

+ Reply to Thread
Page 2 of 2 FirstFirst 12

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts