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  1. dnjan

    Critters for Hair Algae

    What are your preferred critters for eating hair algae? Thanks, Don
  2. dnjan

    nitrates

    I didn't realize that skimming could appreciably remove ammonia. I thought skimming primarily removed polar organics.
  3. dnjan

    nitrates

    I am not familiar with the mechanism by which a skimmer removes nitrates. Please elaborate.
  4. dnjan

    RO/DI Storage?

    Or you could just be having CO2 from the air dissolving in the water, which will increase conductivity and show up as an increase with a TDS probe.
  5. dnjan

    GPH In Sump

    Exactly! In an extreme case (zero flow because the power is out), the sump had better be able to handle all the water in the display tank that is above the overflow.
  6. dnjan

    Refractometer for poor people

    Since seawater refractometers are normally calibrated to sodium chloride solutions (not actual seawater), how large is the error? I remember stumbling across an article on that topic years ago, but don't remember where.
  7. dnjan

    Refractometer for poor people

    the salinity or the specific gravity? Within a reasonable distance from 60F (typical calibration temperature for many hydrometers), the correction is .001 per 10 degrees F. So if your water is 80F, add .002 to the hydrometer SG reading. So for the precision needed for aquariums, a hydrometer...
  8. dnjan

    Refractometer for poor people

    Actually, it is hard to beat the accuracy of a quality hydrometer unless you are spending around 10 times the hydrometer cost on a refractometer. However, cheap hydrometers are a total waste.
  9. dnjan

    Refractometer for poor people

    Only until you break it ...
  10. dnjan

    help with loud pump

    It is very possible that the pump noise is being amplified by the "hollowness" of the stand. One check would be to see if putting a large piece of soft foam (temporarily) in the cabinet makes it quieter.
  11. dnjan

    Painful...

    Luckily, my driveway runs uphill as it goes away from the house. I bought a drinkingwater-safe hose and cut off the metal fittings. I can then siphon the water (saltwater, when I make a Seattle Aquarium run) from the 60gallon tank in the back of the SUV that is partway up the driveway, through...
  12. dnjan

    carbon monoxide detectors

    Thanks for the clarification. I hadn't thought of the exhaust-fan related issues. My house is old and air-leaky enough for that to not be a concern. You haven't taken over the garage completely (yet), I assume, if you are allowing your wife to keep her car in there. Sounds to me like you...
  13. dnjan

    carbon monoxide detectors

    Sorry if it seemed like a troll. Not meant that way at all. Having just installed a CO detector in our house (and not thinking it was much of a problem but doing it because it is now required), I was curious about the situation for which you would think it necessary to protect your tanks from...
  14. dnjan

    carbon monoxide detectors

    OK. If you consider it that much of a risk, why would you put the $100 limit on the CO detector? I just wouldn't think the failure rate of furnaces or water heaters in terms of CO emissions would be that much of a concern. Earthquake, yes. Prolonged power outage, also yes. And depending on...
  15. dnjan

    carbon monoxide detectors

    Is there that much of a possibility of a cracked heat exchanger overwhelming your garage with CO? If you are really worried, can't you tap into the audible alarm circuit of the CO detector?
  16. dnjan

    GFIC electrical question

    I thought GFCI's were required in garages. I have always had much better luck with GFCI breakers than GFCI's in outlet boxes. I guess they cost a lot more for a reason ... (note - above was written before I read the entire thread, so I guess I was correct about them being required in garages...
  17. dnjan

    help with loud pump

    A big, hollow box will amplify the sound as well. Think of what the body of an acoustic guitar does for the sound when you pluck a string. Some foam inside the stand might help quiet it a bit.
  18. dnjan

    Question on flow, please help.

    Out of curiosity - did it take the same amount of time to fill the buckets in Test 1 as it did to fill buckets A and D in test 2?
  19. dnjan

    Cyanobacteria, slime algea, or something

    Sorry - getting back on topic: Phosphates plus nutrients are probably the biggest contributors. I would guess that you have a decent amount of organics in your water. How aggressively are you skimming? Do you run carbon, and if so, how often do you change it?
  20. dnjan

    Cyanobacteria, slime algea, or something

    The intensity of the wavelength that promotes algae growth does not increase as a flourescent bulb ages. It stays the same or decreases. So if the light is not increasing, how can an old bulb promote algae growth?
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