Welcome to AqariumAdvice.com!!!
All great advice so far. It sounds to be that you have rushed into things a bit, do in part to bad advice from the LFS
. The good news is that you are not too far into things so correction is simple. first, return all of the livestock (yes, the trigger is not a suitable animal for your size of tank). Let your tank cycle naturally and slowly. Waiting is the hardest part, seapecially in the begining. It is also the most important part. Follow the instructions for a fishless cycle. While your tank is cycling, read up on fish. A 29gal will still offer you some great choices of colorful fish. Clowns, royal gramma, some of the smaller angel species, sixline wrasse or purple firefish are all great options.
I hate to say, but I think you got hosed by the LFS
. They took advantage of your poition and sold you a bunch of stuff you do not need to keep a successful tank. My suggestion...do not give them any more of your business. For the same $425 you could have gotten enought LR
to meet the needs of your tank, in terms of biological filtration.
Hang in there, it is not too late to do things correcty. Slow down, do your research and keep stopping by AquariumAdvice.com. We are here to help. good luck.