Water evaporation in BW

kass · Post by **kass** » Mon Mar 27, 2006 8:23 pm

I am assuming (correct me if I am wrong) that when water evaporates from a BW tank, it would cause the SG to rise due to less water with the same amount of salt. Is the best way to deal with this to top off the tank with FW and only add more BW when doing water changes?

The Fisherman · Post by **The Fisherman** » Mon Mar 27, 2006 9:51 pm

well, the short answer is: Yes.

the long answer: in a BW tank, when water evaporates, the SG rises ( although in a brackish tank its not going to be too bad) , so I top off the tank with FW every 3 days or so, ( using RO for this is really good too). then when i do a WC your obviously removing BW, so i replenish with BW of the same SG.

saffib · Post by **saffib** » Tue Mar 28, 2006 5:26 am

Condensation trays on top of the tank should preven this becoming a problem. I never top my tank up, with weekly water changes and well-cut condensate trays, I don't find this a problem. If anything, I would get the opposite effect with saltcreep!

kass · Post by **kass** » Tue Mar 28, 2006 12:41 pm

The tank is a mudskippper tank and only has about 3 inches of water and I try to keep it really humid for them. Atleast 1/3 of the water evaporates each week.

Post by **Pufferpunk** » Tue Mar 28, 2006 1:47 pm

I would just top it off then. What SG are they at? Aren't you doing water changes on that tank? I'm waiting for 1 frog to find a new home & then it's skippers for me!

kass · Post by **kass** » Tue Mar 28, 2006 2:00 pm

Its at 1.008. Yeah I change 50% weekly. For a while, when I did a water change, I would take out whatever and then just add more BW to make up for the evaporation. But I noticed that the SG was rising quite a bit, so then I just started adding FW to make up for the evaporation, and cary out normal water changes.

Post by **Pufferpunk** » Tue Mar 28, 2006 2:47 pm

Is that the proper SG of those guys?

kass · Post by **kass** » Tue Mar 28, 2006 3:43 pm

I was planning on keeping it around 1.005, I read that they do well at that level http://members.ozemail.com.au/~thebobo/care.htm.
But it rose quite a bit from my confusion with the evaporation. It was actually up to 1.012 and now I'm bringing it down slowly. They seemed fine at that SG though. I know they can withstand large changes in SG, but I'm sure its not good for the nitrifying bacteria.

Post by **Pufferpunk** » Tue Mar 28, 2006 5:35 pm

This is where mine will be going:

Perfect for skippers, huh?

kass · Post by **kass** » Tue Mar 28, 2006 5:37 pm

Yeah that looks awsome. How big is the tank? What did you use to keep the gravel held up to make the land area?

Post by **Pufferpunk** » Tue Mar 28, 2006 6:44 pm

55g. It's a river tank kit where you silicone in the pieces.

kass · Post by **kass** » Tue Mar 28, 2006 8:05 pm

Oh cool. I have tried to make land areas with not much success. I recently had a tank divider that went around 3 inches high and i filled it up with gravel and topped it with sand. But I just removed it the other day because the skippers stopped going on it.

The Fisherman · Post by **The Fisherman** » Tue Mar 28, 2006 8:07 pm

hmmm, ill have to try something like that whenever i get around to doing the mini-crab setup ive been wanting to do.

kass · Post by **kass** » Tue Mar 28, 2006 8:37 pm

When I upgrade my tank this summer I think I might get a fidler crab.

The Fisherman · Post by **The Fisherman** » Tue Mar 28, 2006 8:40 pm

will the crab be in with the skippers? im not sure theyll play too nice.

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Water evaporation in BW

Water evaporation in BW