I’m a contractor and pretty creative. I had 4 aptasia in my 350 gallon reef tank. Not being satisfied with anything I could find about the removal of them I started thinking about it. Devised a plan that I believe will work. I got my shop vac and with a few plumbing fittings dropped the hose down to a 1/2 clear tubing. Thoughts are suck it out and if it tries to spread that also will get sucked out therefore no risk of spreading. I took out three of them smooth as can be. Waiting and hoping it worked with no spreading. Would love to hear your thoughts on this process.