I have had a few people recently ask for help with AEFW treament after a customer of mine recently mentioned how I was helping him with the steps to treat his tanks before he receives his coral order from me. I thought I'd write a very quick, down and dirty, step by step in the most effective method to rid your tank of AEFW. To start, don't panic. It's not the worst thing in the world, but it will take hard work to rid yourself of this pest. I'm going to already assume you have identified you have AEFW through dip, bite marks, eggs. It should be noted AEFW are VERY hard to see on coral, so you should look instead for the bite marks or eggs. Eggs will only be found on skeleton, rock, frag plugs, etc - never on live coral tissue. Step 1 - You need to remove all acropora from your tank. You do NOT need to remove SPS species that are not acros, so for example, Montipora, Stylophora, etc are NOT acropora and therefore AEFW will not affect them nor feed off of them. When you remove the acropora from your tank you must also remove any encrusted parts from your rock with a chisel or screwdriver, etc. You have to have all traces of acropora out of your main tank/system. This includes all tanks plumbed together as AEFW when hatched can go into the water column and affect other tanks as well. Step 2 - Place all of these acros into a basic QT system. Egg crate, bare bottom tank, heater, powerhead, and GOOD lighting. You want to ensure that nothing else is in this tank including fish, so that the amount of water changes you need to do is kept to a minimum. But, you will need to do water changes. You also don't want rock, etc, as AEFW can attach to that and then you're not able to kill them with dips. Step 3 - Your main system must remain without any acropora in it for a minimum of about 2-3 months. This allows any new AEFW eggs to hatch, grow, and then die off from starvation. Step 4 - Once every week for 2 months, dip all of your acros in something like revive or coral RX for about 10 minutes. Shake them off before removing in order to get any AEFW off. And that's about it. The process itself is simple, just time consuming and a lot of work. I should also mention, you must be prepared to lose colonies/frags of your coral. Between the stress of being pulled into QT and AEFW and dips, it's simply unavoidable. But hopefully, some will survive and after the fallow period, they can go back into your main tank and you can move forward from there! Edit: To be clear, I do not have nor have I ever had flatworms. I dip then QT everything that comes in, break off plugs/rocks/bases and toss them, do multiple dips, and visually inspect all pieces for at least two weeks. If I even see a flatworm come off of a piece I dip, the entire piece goes into the garbage and it will never even go near my tanks. I have however, helped people who have had them as I also do service for local aquarium owners in my area, and I offer advice to people here on R2R. I'm trying to provide this information to help people who are in that unfortunate position.