Hi everyone! I am looking for advice on stocking my Fluval Flex 15. I have 5 Harlequin Rasboras, 13 Exclamaion Rasboras, 2 endlers (that think they are Harlequins) and a Nerite snail. Can I add another 4 Harlequins or is that too much? I've read that you can put 2 Harlequins per gallon, but I don't know how to combine this with my tiny Exclamation Rasboras. Right now it is very lightly planted with real plants, but I'm slowly transitoning to all live plants. Currently I have water lettuce, hornwort, spikey moss and 2 crypts. Thanks!