If it has a substantial skimmer on the system and good flow between the tanks it will probably be fine or have very little fallout even if the worst happens. Sea cucs and their relatives are unlikely to nuke a very big tank or a collection of smaller inter-connected smaller tanks that are hooked up to a big skimmer with good water turnover in the system. Public aquariums keep toxic stuff all the time with mega filtration like that. Similarly, I've seen a couple big LFS setups that had no trouble with stressed/injured toxic critters since they were so diluted in the large water volume and then removed quickly. However, the average home-sized community tank is usually smaller and less able to quickly remove that type of pollutant. A 50gal or particularly nano with a hang-on skimmer are the sorts of systems at higher risk since any toxins are more concentrated and not removed as quickly. Large, high-end reef setups are more comparable to the big LFS and public setups and are better able to handle the situation if toxins are released. The fact that the same animal can nuke a minimally-filtered nano but not necessarily a super-filtered 100gal is part of what leads to so much contradictory info in the hobby about what species are actually toxic to fish and other animals.