OK, I tried this topic on RC but only got one response. I have recently joined the zoo bandwagon and am interested in others' experience with side by side colonies of zooanthids and SPS. Do the zooanthids over run the SPS (most interested in acros) or do the SPS colonies tend to keep them from invading their turf. I have one spreading colony of zoos among my acros and they do not seem to do much harm other than preventing the base of the acro from advancing.