I would stop adding fish at this point, seeing as your clown depending on type will get 3 inches, your goby gets 6'', blenny 5", two damsels=8", and gramma adds 3", which comes out to 25" of fish in a 29 gallon tank. I have three fish in my 33 gallon, a maroon, gramma, pygmy angelfish which equals 11 inches and I was planning on one more 3" fish but I have 65 pounds of live rock in the tank and do weekly water changes. What kind of filtration do you have on this tank because unless it's really good you might want to consider returning the damsels, that would cut down your bioload to a better level and they may turn out too aggressive for your tank.