The roots are starting to come out the top of the medium and growth has slowed down? Do I have to get a bigger pot? It's a 6 in one and the plant is like 7 in tall
Yes you should transplant. Ive never had a plant shoot roots back up through medium though, its usually out the sides or bottom. (roots dont normally grow up without some kind of reason)
If I go buy a few 5 gallon PVC buckets and drill holes in the bottom to drain will that be good enough to where I won't have to transplant them anymore?