The Figure Eight Puffer is an entertaining fish that's full of personality. They look like young spoted puffers with unusual patterns, but they are truly very different fish with very different requirements. Figure 8's are a better choice for most aquarists than the GSP because their requirements are easier to meet. They will only grow to about half the size of a GSP, thus they need only half the space. 15 gallons is sufficient for one puffer, with 10 gallons more for each additional puffer. They are easier to keep because unlike the GSPs who need high brackish to marine as adults, the Figure 8's only need a low brackish of 1.005-1.008 throughout their lives. They also are less aggressive than the GSP.-Fishlore