You should completly stop using Anabolic steroids because you do not no what you are doing.

Not only are you running a steroid, you are running one if not the strongest steroid out there. Tren is for cutting taking mass gainer will just be a waiste if you ask me. I really think you need to stop and go back to the drawing board.

3 questions
Is this your first steroid cycle?
How long have you been working out?
what is your weight?

After you answer these question we can help you more.

Also yes if you run tren alone without testosterone, you will make gains but you are going to loose it once you stop taking the tren and i mean all of it. You test is going to be shut off and its going to be hard getting your natural testosterone running again after your cycle of tren.