Its been 8 weeks since I received these fish and happy to say they have been eating well and growing rapidly. They are now being fed beef heart / seafood mix, some blood worms and brine shrimp. Feedings are 5 times a day with treats in between. Since moving them into the 125 the aggression towards each other has been reduced to nothing. The only aggression in the tank is at feeding time. I clean the bottom daily taking out about 20 gallons of water and on the weekend they get a 95% water change. All the readings in the tank are still at zero. The tds is ranging from 165 when first put in, to by the end of the week around 190. I will keep this routine through the remainder of the challenge.