So I have been using the Reuleaux RX2/3 and the Baby Beast tanks for some time now. They are my favorite and never seem to disappoint. On that note, I came across the Limitless Arms Race dual box mod and FELL IN LOVE. Its something new for me but I already have it in the cart haha. My issue? The RDTA tank im getting with it by Limitless as well. I have no clue how to use it or what else I need to get with it. Limitless 25mm Gold RDTA 4.75ml tank. Do I need to get cotton? I tried to do more reading up on it but I'm not catching on. Any advice? Who has the Arms Race box mod? Do you like it? Thanks everyone!