Since i'm guessing you are in the UK look at this: Link
Refractometers are cheap nowadays and are SOOOOO much easier to use then hydrometers. I used to use a hydrometer for my salt tank and tought it was ok; then I got a refractometer and it was like a whole new worlds. I would highly recommend.

i love figure of 8 puffers...are they complicated to keep? The lfs said they should be separate no mention of brackish water. Do they grow big? What is minimum size tank I could put one in?![]()
I mustnt be tempted I am a betta girl. They are giving me grief at the moment though my bettas they look sickly hubby says it is probably as most of them were bought at same time and are same age...

lovely looking guy! that's exactly how one of my colomesus gets when eating hahaWell...went into my local place for Apistos, Killies and a pair of Nanochromis Nudiceps....and as per bloody usual came home with something completly different.
A Pair of Fig8 Puffers![]()
Now i was advised they were in fresh water, but later found them to have been in Brackish! So i raised the tank in the house from fresh to Brackish over 5 hours and this morning its sitting at 1.005/1.006 which is fine. The Puffers are in the tank and zooming about the tank like nutters.
Im hoping i havent killed my filter bacteria...fingers crossed. My main question is whats the easiest and quickest way to measure the marine salt to give a 1.005 SG as last night while mixing in the buckets it was sorta guess work.
anyway onto a couple of pics
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