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i agree. the puffer i had ate everything. i had to donate him to my local elementary school. sailfin mollys are tail biters. angels can be a little territorial but they do coexist well with most species of communnity fish.
Also, mollies and puffer really do better with higher pH and a little salt. Anglefish like the exact opposite. For the anglefish/tetra issue, try tetras larger than neons, like congos, emperors, and others.
Good Luck!
Ben Driscoll