I WOULDN'T RISK IT. WAIT 'TILL THE TANK IS FULLY CYCLED, REMOVE THE DAMSEL AND START FRESH. THAT W/B MY ADVISE. IF YOU REALLY LIKE THE DAMSEL YOU MAY HAVE TO REMOVE HIM INTO ANOTHER TANK WHILE YOU STOCK WITH RATHER SMALL FISH SINCE IT IS A 29. MY CHOICES: A PAIR OF PERCS, A ROYAL GRAMMA, AND A FLAME HAWK. START WITH PERCS AND ADD VERY SLOWLY MORE FISH AT 2 WEEK INTERVALS. MY 2 CENTS. GOOD LUCK.