You don't need fish to cycle your tank, why put tetras (or any fish) through the stress of such an ordeal?
Also, your stock list sounds like a train wreck waiting to happen, and IMO you've been given some piss poor advice earlier on. Why not just choose some species that are suitable for a 125 long term? If your long term plan is to rehome most of everything, and add & substact as you go along, then just toss whatever floats your boat into the tank, grow them out and keep what you like.
Also, your stock list sounds like a train wreck waiting to happen, and IMO you've been given some piss poor advice earlier on. Why not just choose some species that are suitable for a 125 long term? If your long term plan is to rehome most of everything, and add & substact as you go along, then just toss whatever floats your boat into the tank, grow them out and keep what you like.