All I have ever kept is reds, and the only reason i dont like them is cuz they are so skitterish!!! Once I get my 194 gallon (60 by 30 by 25) I am going to start a mixed pygo tank (1 piraya, 1 ternetzi, 3 caribe, 4 reds). Are caribe, terns, and pirayas skitterish like reds? Also, is that too much for that tank? Could I keep them in there until adulthood?