OK guys, I have another idea. Is it possible to keep a single GSP in a 20 gallon for its life? I heard they need about 20-30 gallons per GSP, but if I only keep one then would this be suitable for him? Also, I was really considering a Porcupine Puffer for the bigger tank instead of the two GSP idea. However, I'd probably need about a 100 gallon tank at least, correct? I looked up info on them, and I really want one. I can't register onto that puffer forum, it won't send a password to my email. Can I get a 100 gallon tank for a GSP and a porcupine when the GSP is big and ready for marine? What other puffers would go with a porcupine, and I'm going to need tank sizes as well. Thanks, I know I'm annoying.