Hi I am new to keeping tropical fish, I was given a tank with a load of Endlers guppies in it. I have recently added 5 Glowlight Tetras, 5 Platys, 5 Neons, 1 Siamese fighting fish, 5 Swordtails, and 2 Albino coi. The man in the shop said that all of these would be fine with the guppies, but...