Sorry, got interrupted:
Just get a cheap betta bowl heater ($10?) and that is really all you need.
I just hand mix my water with a wooden dowel, lately, but every once in a while, i will mix and then let it sit with a pump running inside of it.
You can gey a small 8-80 pump from amazon for about $8,and besides occasionally stalling, they do the job.
In an ideal situation, I mix in a 5 gallon paint home depot bucket, exactly the amount of water i want to put in with a betta heater, a small pump and my wooden dowel,and let circulate for at least 10 minutes (circulating, pre mixed water has been shown to shelf just fine for up to a month with no degradation, FFR, in some cases, much longer).
In another 5 gallon bucket, i pull, using the same pump i mixed with, the same amount of water i plan to replace.
I hold onto that water, cap it, put the new water on top, drop the pump into the new water, and start pumping it into the tank.
That is the ideal situation. But because I culture copepods and so much other stuff, I actually vary the way i do my water changes every time.
I do a 10% water change every 2 to 3 weeks max, and seldom heat it, but usually mix my copepod culture with a slow triclle of the higher salinity water for thr reef. I have to go from 1.20 to 1. 25 when i do that, so I typically mix my new water at 1.27 or 28, as well as another bucket at 1.25,so that once 1.25 is reached with the pod/new mix, I can just fill up to the right volume.
HAY DESMADRE!
Don't keep mandarins XD
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