Some snails in the brackish Baltic Sea

[darktoad]

Cool - the orange bit is macro algae ?

[Blötdjur]

Yes it is, it is relatively wide for being Bladder Wrack (Fucus vesiculosus) though.

[Blötdjur]

That piece looks old and pale compared to other pieces actually. First they are a light greenish yellow-brown, then yellowish brown, then orange brown and then dark brown, at least sometimes.


Brown algae has some of the most pretty algaes, for example there is supposed to be one with blue spots.

[Blötdjur]

This tank is doing well! Apparently nerites and isopods are doing well and I have a lot of little hydrobid offspring!

The temperature is often below 10 d. C (about 50 d. F).

[jonfr]

I want to setup a cold seawater tank. But I don't have space and I have no idea how to do it.

[Blötdjur]

Well I am just using a little opening in my window to cool two tanks in the window.

I wonder how much you can cool water with a big fan if room temperature is 25 d. C (about 77 d. F)?

[pbgroupie]

IMPO, the "swamp cooler" (fan over water) will bring down the temps a few degrees but you'd lose a lot of water through the evaporation, which would change the salinity concentration in your water. What do the summer temps of the real seawater get to be where these creatures normally live? If you think the water temps are too high, you could always freeze a bit of water in a small plastic soda bottle, cap it, and float it on the surface to keep things cooler.

[Blötdjur]

Well, I thought to do a "radiator" system, with separated water circulating from and back to a cooler-tank with a little pump! There I can drop ice and stuff!

I don't know how warm it gets outside Stockholm... it can get a little above 20 d. C (about 68 d. F) I guess. I have bathed there some times.

BTW, coldwater tanks can be very exciting, it's just not very common!