• Welcome to TONMO, the premier cephalopod interest community, and birthplace of #WorldOctopusDay and #CephalopodAwarenessDays. Founded in 2000, we are a large community of experts, hobbyists and enthusiasts, some of whom come together when we host our biennial conference. To join in on the fun, sign up. You can also become a Supporter for just $50/year to remove all ads and enjoy other perks. Follow us on Twitter for more cephy goodness.

Octo tank for fish

Wartooth

Pygmy Octopus
Registered
Joined
Feb 12, 2004
Messages
7
I have a 100 gallon tank that is sitting empty in its box (got a really nice deal on it). As we are soon moving into a new house, I don't want to fill it yet. Would like to get an octo. for it in the future, but have a young disruptive 3 year old boy and a 100 pound nosy malamute. The old dog only has another year or so left in him. My son should mature a bit over the next 2 years. What I need to know is .... If I set up the tank at the correct salinity, gravity, pH, etc. for an octopus, what other fish can I keep in it until the time comes?

Thanks,
Richard
 
Joined
Jan 8, 2004
Messages
651
IMO - just about anything as long as you acclimate them to the higher salinity.

I just used my Red Emorer Snapper to help cycle Ochi's Tank. There are certain species that can not handle the environments. But JUST ABOUT everything your lfs sales should be fine. Research all species, but I think you will be fine with most you see. :biggrin2:

Keep in mind they have to leave the tank when your octo arrives.

Hope this helps.
 

joel_ang

Architeuthis
Registered
Joined
May 15, 2003
Messages
2,028
Fish like damsels, clowns, cardinals and most things under the sun can be kept for the time being but you have to remove them when the octo comes.
 
Joined
Jul 24, 2003
Messages
525
whooaa there!!! I had the thought that all marine tanks are 1.026 on the salinity, are you sayin an octo tank is different from fish and other tanks? Please explain.

but before you do.....as i understand it 1.026 is the same as sea water and it has to be this to keep it saturated in air, or if you can over saturate like around a rocky beach were the waves are smashin an forcin loads of air in. i.e. loads of oxygen good for 3 hearts.

but am i gettin confused between salt an oxygen here? i know salt is the salinity/specific gravity in simple terms...oh dear im gettin confused its been a major long day...... :bonk:
 
Joined
Jan 31, 2003
Messages
251
Most fish tanks are kept at around 1.023-1.024 or 31-32ppt. Octos usually do better at a little higher salinity. But most marine animals can take a bit of flux as long as they are slowly acclimated to it. Natural ocean water can differ in salinity a lot depending on if there are any rivers nearby, temperature(evaporation rate), and a bunch of other variables. A lot of marine species prefer a lower salinity while young and a higher salinity when older. That's why a lot of young fish are found in estuaries or at the mouth of rivers. Lots of variables...
I'm not sure about the secound part of your question. But just so you know... salinity is measured in specific gravity (like 1.026) or parts per thousand (like 33ppt). PPT or Parts per thousand is like a fraction...
33 parts of salt per every 1000 parts of fresh water. Easy enough :wink:
feel free to quiz me if you have any other questions and I'll try to help...I work at an aquarium so I might know.
 
Joined
Jul 24, 2003
Messages
525
thats brilliant nice one!!

so basically your sayin the younger fish prefer less salty water by bein by the rivers and the older prefer saltier? hhmm thats intrestin (if ive got that right)

so i wonder why octo's prefer a higher salinity, any ideas?

p.s. i was thinkin oxygen played a part in the salinity, cause i remember readin somthin like its not just salt thats taken into account in the salinity measurements, theres sumthin else.

then i was thinkin about the way oxygen is is higher around surfy areas...put 2 an 2 together an came up with 5?!?!?! :lol:
 

Nancy

Titanites
Staff member
Moderator
Joined
Nov 20, 2002
Messages
5,772
Many of the LFSs and marine aquarium keepers here feel that fish get less disease when kept at a lower level of salinity - I've seen it range from 1.19 to about 1.22. Octopuses, on the other hand, need the salinity level of seawater, so should be at 1.026.

This lower salinity theory has an effect on octo keepers - if you're in a hurry, you can't just buy salt water, like the fish keepers can. You have to add additional salt to bring it up to the level you need.

Nancy
 
Joined
Jan 31, 2003
Messages
251
Scouse said:
thats brilliant nice one!!

so basically your sayin the younger fish prefer less salty water by bein by the rivers and the older prefer saltier? hhmm thats intrestin (if ive got that right)

so i wonder why octo's prefer a higher salinity, any ideas?

p.s. i was thinkin oxygen played a part in the salinity, cause i remember readin somthin like its not just salt thats taken into account in the salinity measurements, theres sumthin else.

then i was thinkin about the way oxygen is is higher around surfy areas...put 2 an 2 together an came up with 5?!?!?! :lol:

And that was just an example to show that saltwater fish can stand lower salinities...not all fish do that. But just to give you something to ponder...over here on the east coast of the US, brackish water estuaries are considered a nursery for young fish and inverts because it's a safe nutrient rich place. 90% of our seafood(fish, crabs, shrimp, clams, etc) spend part of their life in the estuaries. These estuaries range from only 10-20ppt, whereas the nearby ocean is around 33ppt. So those fish can handle salinities that low. This has nothing to do with octos, but some neat info eitherway.
John
 

Forum statistics

Threads
20,892
Messages
206,862
Members
8,476
Latest member
AndyR83

Monty Awards

TONMOCON IV (2011): Terri
TONMOCON V (2013): Jean
TONMOCON VI (2015): Taollan
TONMOCON VII (2018): ekocak


Top