I'm currently using a Halcyon SS BP/W with a weighted STA. I want to pick up A Hollis BP/W setup( I like my Halcyon for diving Alum 80's and 100's and for traveling) I want another rig as I just picked up a HP130 and would like another ( makes bug huntin easier, hate to go backin and switch tanks and try to find the little suckers again) but I don't like to change anything around. Since I have a little extra...... a new rig sounds good to me. So.... question do I need an STA for the Hollis setup?