a couple questions...

Discussion in 'Octopus Care' started by oceanbound, Jul 18, 2006.

  1. oceanbound

    oceanbound O. bimaculoides Registered

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    ok so i finally found a dealer in colorado springs. he himself has a octo tank at home. but there were a few things he said that puzzeled me. firstly, my tank here is a 55 gallon with about 10 lbs. of live rock in it and some dead corals and rocks also there is 1 inch thick aragonite sand. it has been cycling for about one month and everything looks fine (ammonia, nitrate, and nitrite are at zero). i had the salinity at 1.028, but the dealer told me that since i'm at high altitude (about 8000 ft.) my salinity levels have to be around 1.020-1.021. that seems really low to me. he also keeps alot of water flowing in his tank with submersible powerheads. i don't remember reading much about water circulation in reference to octos. he also gets his octos from fiji and he isn't sure on the species, but he did call it a bali which i know isn't really that great. he said that it is a fairly smaller octo. max 18 inches from tenacle to tentalcle i think. can anyone help me with all this stuff? does anyone know what species he might be selling?
     
  2. cuttlegirl

    cuttlegirl Colossal Squid Supporter Registered

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    Can you visit his octo tank and take a picture?
     
  3. oceanbound

    oceanbound O. bimaculoides Registered

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  4. oceanbound

    oceanbound O. bimaculoides Registered

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    but other than that i just met the guy...so probably not
     
  5. DHyslop

    DHyslop Architeuthis Supporter

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    His salinity/altitude idea doesn't make much sense to me. The water will expand a little bit as air pressure decreases, but since this is a volumetric effect a hydrometer will still give you the right answer.

    The guy seems to be reasonably knowledgeable anyway, though. The so-called "bali octopus" is what shows up on most LFS distributor's stock lists. He orders them because they're easy for him to get, unlike bimacs or briareus which take a good bit of luck and timing :)

    Dan
     
  6. oceanbound

    oceanbound O. bimaculoides Registered

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    isn't it true that the higher the salinity the harder to achieve water-oxygen saturation (The more salt there is in the water the less oxygen can fit into that same volume of water)?
     
  7. DHyslop

    DHyslop Architeuthis Supporter

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    That's true, but it isn't a big effect. That might have been what he was after: by lowering the salinity the water can have a higher DO (dissolved oxygen).

    Check out this calculator:

    http://aquanic.org/images/tools/oxygen.htm

    At sea level, 36per mil, 26 degrees C, max DO ~ 6.62 mg/L
    Same salinity and temp at 8000 ft, max DO ~ 4.93 mg/L

    That's a big change!

    Now if you stay at 8000 ft and drop the salinity to 26 per mil, you get a max DO ~ 5.21 which isn't much of a change, three tenths.
     
  8. oceanbound

    oceanbound O. bimaculoides Registered

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    currently i just lowered the salinity so it is at about 1.023. do you recommend keeping it the same, lowering it, or raising it?
     
  9. oceanbound

    oceanbound O. bimaculoides Registered

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    and what is the temperature that i should have it at??
     
  10. Illithid

    Illithid Vampyroteuthis Supporter

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    The only thing I really questions is the use of all the octo blenders...I mean powerheads. Octos need alot of flow, but as I have read for oxygen saturation and filtration - which powerheads do nothing to help. I setup my tank with high flow, but with a strong external pump, not powerheads, and a trickle filter + protein skimmer.
     
  11. oceanbound

    oceanbound O. bimaculoides Registered

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    i can put oxygen into the water output so it actually does help somewhat with o2 saturation
     

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