the tank is very nice, i did notice you have a heck of a lot of bubble algae though, before adding anymore livestock id suggest you try to illiminate the excessive nutrients allowing this to grow first, otherwise it will engulf the whole tank before you know it and wont be able to get a grip on how to remove it, also how much live rock is in there, i ask because imo with the extra stock your going to add you may need a little more to keep up the demand of removing the forming amonia which will develop, im not critisising in anyway at all, just trying to help out buddy