TDS is fine. If they are hybrids then they will be pretty hardy anyway. Once they start giving you some TB offspring then you may need to worry about extra filter capacity for bacteria and extra oxygen. Like i said though, being bred from hybrids will make them hardier.
If you start breeding TB with TB to improve quality then extra filtration and oxygen is a must.
If you start breeding TB with TB to improve quality then extra filtration and oxygen is a must.