Brand New tank Cycling?

[Toby_H]

The applicable practical information the OP deserves here is...

Raising your tanks temp to "ideal" temps for bacteria will kill your Rosie Reds, thus pushing these numbers at you is useless...

Temperature does in fact affect bacteria growth rates. But in all practicality it's effect on your tank will be minimal. The lower temperatures may make your cycle take a few days longer, but raising the temp will kill your fish.

Also, not doing water changes will allow the ammonia/nitrite to build up to lethal quantities which will kill your fish and at excessive enough ammounts can be damaging to your bacteria colonies.

With a whopping 50% increase from 20C to 30C, we get an estimated 5% increase in growth rates per 1C increase in temperature over 20C. For an increase in temperature from 21C to 28C (70F to 82F), we get a corresponding 35% increase in growth rates.

It's just silly of you to suggest that the effect of temperature would have a linear effect.

It's also not helpful at all for you to insinuate that temperature is going to be a big deal in this situation. You are correct that temperature effects bacteria growth rates. But no need to pretend it's a critical concern that the OP needs to concern himself with.

 

[squint]

Raising your tanks temp to "ideal" temps for bacteria will kill your Rosie Reds, thus pushing these numbers at you is useless...

Irrelevant. That has no bearing on the fact that your previous statement:

Rosie Reds are cold water fish, so the 70*F/21*C is wonderful... someone will surely suggest you warm up the tank suggesting that the bacteria will do better at a warmer temp. But in reality the possible difference it will make on the bacteria is negligable... So again, the 70*C/21*C is fine...

...is completely false.

But since you're trying to bring up a second issue to cover up your earlier misstatement, well, you're wrong there too.

ESTIMATION OF ACUTE UPPER LETHAL WATER TEMPERATURE TOLERANCES OF NATIVE ARIZONA FISHES

40.4C is almost 105F!

Temperature does in fact affect bacteria growth rates. But in all practicality it's effect on your tank will be minimal. The lower temperatures may make your cycle take a few days longer, but raising the temp will kill your fish.

Fifty percent from 20C to 30C is far from minimal. It's significant.

It's just silly of you to suggest that the effect of temperature would have a linear effect.

No, what's silly is to think that an increase from 21C to 28C won't yield most of the 50% increase from 20C to 30C, linear or not.

But in fact it is linear:

Nitrification Performance of a Submerged Biofilter in a Laboratory Scale Size of the Recirculating Shrimp System

Temperature had a significant effect on NR (P<0.05). The activity of microorganisms responsible for the bio-oxidation of ammonia increases with temperature in the normal temperature range (Shammas, 1986). Wortman and Wheaton (1991) also found a linear relationship between the ammonia removal rate and temperature at 7–35°C. In addition, increased temperature causes an increase in the unionized ammonia level in the TAN content (Groeneweg et al., 1994; Kir et al., 2004; Kir and Kumlu, 2006). Previous reports and our own results show that an increase in temperature results in greater ammonia removal and growth of nitrifying bacteria. In turn, this decreases the time required for the biofilm to reach the critical active thickness and the duration of the ammonia removal cycle.

 

[dawnmarie]

I just love the smell of napalm in the morning.
Seriously though, this is an interesting exchange. I feel like we're about to learn something.

 

[Nyghtfire]

Yeah it is interesting and from the research i've done it just seems to be more a personal opinion over anything else lols.
Took a water sample to the pet store today, i had nearly 0 amonia, some of the good bacteria, (nitrite or nitrate, i can never remember the difference) and a ph of 7.8
as i intend this to be a tank for some small cichlids, i'm not to worried about the ph.
but according to my LFS i should be ready to go, just leave it a week and i should be good

 

[dawnmarie]

You will be wanting to get test kits of your own to monitor water parameters.
You might benefit from a little research on the Nitrification cycle.
Ammonia, Nitrite and Nitrate are not bacteria, rather , they indicate how the cycle is working.
You will want to monitor Nitrate levels regularly as this will indicate when a water change is neccessary.