NM...that summs up my outlook on the tang subject as well. If you have enough years (under your preverberal belt) to know what your system can handle... (knowing weather your system can handle the tang in questions, needs or not) is what is the REAL deciding factor on weather a tang can or should be added to your system. IMO, alot of factors fall in play here, but as a general rule, tangs should not be housed in a tank smaller than 55g. Again, just my own personal opinion.