Have had a fluval flex 123l for about a year now and is heavily planted with 12 lambchop rasboras, 10 dwarf rasboras and 10 phoenix rasboras with a couple bamboo shrimp. Do around 40 to 50 percent water change weekly also. Do you think there's potential to add any more of the species I currently have to make them feel even more secure, tank does feel like there is room for more fish, thanks