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| View Poll Results: Do you test to determine when your GFO needs changing? | |||
| Yes |
   
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6 | 7.89% |
| No, I change it on a schedule |
  
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22 | 28.95% |
| No, I change it when my tank looks like it needs changing |
  
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20 | 26.32% |
| I don’t use GFO |
  
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28 | 36.84% |
| Voters: 76. You may not vote on this poll | |||
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#4
11-30-2009, 08:17 PM
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I've always been too cheap to buy a good PO4 test kit or meter. Recently I've gone from a 2 month interval to 1 month to see if I notice any difference. Since I have macro-algae in my sump, and very little algae in my display I assumed PO4 should be low in my tank... but I don't know.
One of the reasons I'm curious about this is despite having unmeasurable nitrates, and 400w bulbs the Purple Digitata in my tank is always brown. I wondered if phosphate may be the cause of this. Last edited by Reefer Rob; 11-30-2009 at 09:56 PM. 
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