Density.

[Rinaldo Fontenele]

Which best value of density to be used in reefs?

 

[Anonymous]

For a water temp of 27C-30C I'd recommend a Specific Gravity between 1.025 and 1.027.

 

[mike90]

i keep mine at 1.025

 

[Rinaldo Fontenele]

In my nanoreef (about 140 L), the density is 1022 20°C but many people in Brazil tell me to increase to 1025.

My reef was 3 weeks.....

 

[Anonymous]

20C seems really cold for a reef tank. Are these local corals that are from a cooler reef environment?

 

[Mihai]

20C = 68F - really cool. You should target 76-80F. Anyway, for your question, 1.025-1.026 is what you want for reef.

M.

 

[WRASSER]

Mihai is right. it seems to less problems with my tank since i raised the salinity to 1.025 and the temp.78-80f and that was 4 years ago 8) :wink:

 

[Rinaldo Fontenele]

It forgives me, I make a mistake. The temperature in fact is 25°C.

 

[Anonymous]

1.025 at 25C is good in my opinion.

 

[Rinaldo Fontenele]

Dear Guy,

What is your densimeter??

 

[Anonymous]

Dear Guy,

What is your densimeter??

I actually use a refractometer and keep my systems at a salinity between 35-36ppt and a temp of 29C-30C in summer and 28C in the winter. That's about the equivalent of a density of 1.026.

If you are using the type of densimeter (hydrometer) that has a swing arm to point out the density then it may not be giving you an accurate reading. They are usually not very accurate and are typically inconsistent. The floating glass hydrometers are accurate enough.

 

[Mihai]

If you are using the type of densimeter (hydrometer) that has a swing arm to point out the density then it may not be giving you an accurate reading. They are usually not very accurate and are typically inconsistent.

Not in my experience. Actually I can't comment on accuracy but consistency-wise mine is very good (and I don't have a special one - your run of the mill coralife). On repeated measurements I always get results within a quarter of a 0.001 density. However, I heard others making the same statement on its poor accuracy/consistency, so it's either a popular myth, or I'm lucky.

M.

 

[ChrisRD]

I agree with Guy that swing-arm hydrometers are frequently not very accurate (even if they're consistent). If you know someone with a refractometer you can check your swing-arm against it. If it's off, just record your "offset" so you can correct future readings...

 

[Rinaldo Fontenele]

Thanks a lot!!!!
I´ve a friend that has one refractometer, then I´ll make a visit to making the calibration of my floting glass hidrometer.

 

[Anonymous]

Thanks a lot!!!!
I´ve a friend that has one refractometer, then I´ll make a visit to making the calibration of my floting glass hidrometer.

Perfect!!

 

[Tackett]

FWIW I usually keep mine around 1.027 and a temp of 80.

keep in mind though, the higher the temp, the higher the motabolism of your inhabitants. This means that at higher temps you would be prudent to feed you fish more often.

This next statement is purely coincidental with no sound evidence, but it seems that inhabitants also seem to be more colorful at higher temps.

 

[Rinaldo Fontenele]

keep in mind though, the higher the temp, the higher the motabolism of your inhabitants. This means that at higher temps you would be prudent to feed you fish more often.

This next statement is purely coincidental with no sound evidence, but it seems that inhabitants also seem to be more colorful at higher temps.

Tackett, is not good high temps for corals, correct???
I intend contorol the temp of the my reef in 25.6 to 26.6 °C (sorry, here in Brazil we use °C)...... :wink: :wink: :wink:

 

[Mihai]

You can go up to 28C (83F) without problems for corals. 25.6-26.6 is also good.

M.

 

[Tackett]

+1 on what Mihai said.

 

[Rinaldo Fontenele]

Ok, one more time......Thanks to Mihai and Thacket!!!!!!
We've a great problem in Brazil.....the temperature.
Many peple need to use chiller and fan (I don't know that is correcet word), to control the temperature.