figure 8 puffer salt

I am also faced with a similar dilema. I intend to put some Green Spotted Puffers in a 30g tank. You will have to perform a couple of simple mathematical operations to determine the correct amount using the ratio (established by the manufacturer) of salt/gallon in terms of specific gravity.

For example, 1/2 cup of the marine salt i bought per gallon gave a specific gravity (SG) of 1.022

I'm going to give you the mathematical operations i did for my 30g tank

The ratio (established by the manufacturer) is 1/2 cup per gallon SG 1.022

If i wanted full marine conditions i would need then 15 cup for 30 gallons at SG 1.022

7.5 cups would give me a SG of 1.011 for 30 gallons (half the SG since it is half the amount of salt)

3.75 cups would give me a SG of 1.0055 for 30 gallons

I needed between 1.010 and 1.005, so anything between 3.75 and 7 cups would be, THEORETICALLY, the amount of salt needed, given the specifications of the manufacturer (1/2 cup per gallon for SG of 1.022)


It is recommended to have a Hydrometer at hand to actually measure the Specific Gravity in the water

The link below has been very helpful to me, take a look at it.

http://www.pufferfish.co.uk/aquaria/water/brackish/faq/faq.pdf#search='brackish%20water%20faq'

Ooops, i guess i answered how much and not what kind

Regarding what kind... i am using salt for saltwater aquariums (marine salt)

I use Instant Ocean.

Instant ocean works great I had more success keeping brakish puffers in full saltwater than I did brakish. My full salt figure 8 lived over a year with marine fish before my gold stripe soapfish ate him

be careful with hydrometers. the ones you buy at fish stores are incredibley inaccurate. Some are right, some are way off. I used to have 3 and they all read different salinities. One would read 1.019 while another would read 1.026.