Just got back from lowes

I think i fuckedup and got a pump to small, its 100-155 gph but the 300 gph one was like $44.95...was i at the wrong store, or didnt look good enough?

I got 8 elbows (90dgrees) 4 are female female, 4 are male male

5 slip T' fittings

4 shrub sprinkler nozzels

4adapters

i know that may not make sense to you, but do I for sure need a bigger pump?

I also need to get the tub, they have 14 gallon and 18 gallon ones,

also do you use the rubbermade container to house the pipes and misters, and as a resevoir for water/nutes, or is there a seperate resevoir?