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Old 05-30-2012, 01:03 AM   #11
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Green spotted puffer is not a freshwater fish. They are a high-end brackish water fish, but are best kept in saltwater in captivity. People who have kept them in freshwater are only able to keep them for a few years before premature death. These fish are able to live past 15 years under saltwater captivity. A 20g is way too small for a green spotted puffer. 30g is the bare minimum with no live rocks, but even that is on the small side.

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Old 05-30-2012, 09:04 AM   #12
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The only decent size puffer for a 20 gallon is the figure 8 puffer they are a brackish fish(about 1.05 salinity) and are great little fish. They have all the personality of their larger cousins(mine eats out of my hand and greets me every time i'm near the tank). 15 gallons is the minimum for 1 with nothing else in the tank. Keep in mind if you do decide to get a brackish puffer a lot of LFS keep them in fresh water and you will slowly have to raise the salt levels to brackish(both the green spot and figure 8 do much better in brackish).

Tropical Fish for Brackish Aquariums: Figure 8 Puffer

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puffer, pufferfish

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