Hi I have a RIO 125 tank that’s about 4 weeks into its maturity and I have been adding fish gradually. I added 4 Corydora's 6 Dragon tailed guppies and 6 Black Neon’s 2 weeks ago, the guppies have been fighting non-stop! Yesterday I added 1 silver shark and 4 (2f 2m) swordtails. The guppies have...