Tren is not derived from fina. Fina is the brand name for the implant pellets that happen to contain tren ace. Attach an enanthate or hex molecule and tren becomes tren E or parabolan (also a brand name). Tren is derived from nandrolone
Anyway, i was already on 125mg test a week before running tren alone and i didnt change that test dose. Knowing what I know about tren and test, if i would have ran the test at the same or more as the tren, it would have just given more sides. I can say this because the gains and sides from just the tren were the most ive ever seen. Tren is so much stronger than anything Ive touched, it just doesnt help to add anything more androgenic like test. Now next time I might run something like primo or EQ along the tren since those are very mild and would complement nicely.