That sounds fine. I don't think anyone has mentioned this but it's known on fishlore--the thing about TSS is you may never see nitrites in a tank it's used in. Although the manufacturer won't disclose the species of nitrifying bacteria used in TSS (nitrosomonas oxidizes ammonia and nitrobacter oxidizes nitrites), the absence of a nitrite spike when using TSS suggests that there probably is some nitrobacter in TSS. It's in this way that TSS can significantly shorten the time it takes to cycle a tank.
I don't know how much time and money SeaChem puts into making sure their product doesn't cause SafeStart to fail. But I do believe that Tetra did spend the time and money to find that any water conditioner that removes chloramines (not just Prime) will cause their product to fail. I mean Tetra (sorta) crated the product and one would think that they would know more about TSS then SeaChem does. But like I said, it's not just Prime that will cause the TSS to fail, it's any water conditioner that removes chloramines, and as far as I know all water conditioners remove chloramines. But I suppose if you were sure you didn't have chloramines in your water and could find a water conditioner that does not remove chloramines, you could use that and not have to wait the 24 hours before adding TSSThe only problem(s) I see with that statement is that it completely contradicts the statements by Seachem about their product. So, who do you believe? It also isn't listed on the Tetra SS product use guidelines provided on the product NOT to use the ingredients that are in Prime along with TSS in a tank.
If indeed Tetra does put ammonia in their product, why isn't it listed in the MSD for their product?
TSS also says this: "SafeStart Plus will finish the cycle within a few days, depending on where you are with it, how many fish you have and how much you are feeding" and we all know that's not true. I have yet to see any tank "finish the cycle within a few days" after using TSS. They also state "If fish are added at a proper rate, along with the SafeStart Plus, they won't experience any spikes in ammonia or nitrite." That too we know isn't true. Based on every single person I've advised and seen other people advise on this site, I've seen 0 (zero) people who have not had an ammonia spike after adding TSS regardless of when they've used it during their cycle.
So, I guess the decision to use a product comes down to this: do you base using a product purely on what a manufacture who sells it and claims the product does? Or do you use a product based on what your own investigation, experience, common sense and science, prove that it does?