there is a whole forum dedicated to macro and care on RC i would stay away from caulerpa, its cool in the beginning because it grows fast, the issue is it spawns and takes nutrients away from more desirable macros. co i didn't have an issue with for low to medium macro load, when you want it to start looking like a jungle you will need to balance the iron for the reds, the nitrogen for the reds and greens and co2, get one out of wack and things suffer, my advice for price if you are looking to stock is with live-plants.com, Russ the owner is very service oriented and his portions are 10x what other sites give you. his shipping is top notch and keep his bags, they are similar to dialysis bags and keep the ph from going crazy if you decide to ship your macros to another macro person. His stuff is seasonal, but sometimes you can call him and see what he has but hasn't listed, and you get something cool. sea grasses can be a pain the type i had the most success with is turtle grass but a deeper sand bed is needed. light is another big component. its like having a reef the better the lights the better the growth, i got good results from 10k i ran halides and vhos, if i were to do mine over again id do all ati 10k t5s. your tank would look stunning with their bulbs.