Oh my the "T" word in a 55G
Better watch out who you tell that to there are a lot of expressive individuals who like to decide whats right and whats wrong.
Welcome to Canreef! If you have any questions please don't hesitate to ask on the board (or pm). This site has lots of questions beat to death, but its still alright to ask them. This site is about people helping people in this very beautiful and rewarding hobby.
As for the gonipora I had good sucess with reef roids, but many of them only last a year in captivity (some last much much longer though, so cross your fingers)