Losing battle with aptasia

[Beverly]

I have used vinegar too with a one ml syringe. First turn off the powerheads for about a minute so the vinegar won't be blown all over. Then inject, if you can, the vinegar directly into the aptasia which will probably retreat when you get close to it. If you can't directly inject the aptasia, poke the syringe as far into its hole and gently squirt the vinegar. Leave the powerheads off for 2-3 more minutes for maximum effect.