If you dont trust your medium i guess its up to you.
Place something under it if it cant reach the lamp compared to the others
But in good medium its still has plenty of space, If it gets alittle bit rootbound(actually makes transplanting easier) shake it loose or even cut . I wouldnt wanna shock the plant right now by transplanting. Looks healthy enough. I just use sand 10-15%(draining) and potty earth. If you wanna switch its not to late. Nothing wrong with that
Im no expert