From one Noob to another.
I have learned a lot from these guys on this forum. It might sound harsh what they are telling you, but they don’t mean you any harm. They are just trying to make sure you don’t loose a fish or your $40.00 investment.
If I were you, I would bring the fish back to your store and I would see if I could get $40.00 worth of live rock. (Noticed you only had 25lbs of Live Rock)
I have a 100g tank I still lack the appropriate amount of live rock to correctly sustain fish life and I have learned the hard way, (fish death) that the guys on this board really do know their stuff. They aren’t making fun of you even if they sound harsh. They just want you to make the right decisions. Just as you want your fish to not starve to death, they don’t want it to stress to death which will happen if he isn’t in the correct sized tank.
What these guys can do is, help you find cool fish that will work great for your size tank. There are tons of cool fish out there, just have to see what is compatible with your system...