My first tank I added it later and it was a huge PITA. My current tank I did it from the start. I use both chaeto and caulerpa and I seeded it with pods from algae barn. Just keep an eye on your nutrients. If it's working right it will soak up both nitrate and PO4, if either one starts to rise you might have to add the other, I have to add neophos to mine or else my macros stop growing and my nitrates start to rise. One of the benefits is that chaeto is in high demand and I can trade it in for store credit at the LFS.