to be honest I think most people have problems with eels eating fish due to their feeding schedule.My first eel was a SFE I had it for just over 3 yrs I keft a cleaner crew hermits snails even an engenerr gobie which was suposed to be a nono with eels.also damsels .My first set up stock of my agressive tank was 10 damsels(which slowly killed each other off) normal behavior issues for damsels but I also kept a vol lion s&s puffer SFE ,majestic foxface,silver scat,I feed my tanks daily on a normal basis.2 times with pellets and flaked foods .and once in the evening with frozen foods and larger meaty foods for predators.none of these other fish including the eel botherd my damsels.in fact i had no issues with other than damsel issues .until i got my panther grouper and my niger trigger,then later a lunear wrasse(all damsels dissapeared after they arrived(slowly) after the eel passed away after 3 1/2 yrs in my tank. I did replace my eel (not the damsels) they go through feeding spirts of every day feeding down to once a month feeding depending on the eels appetite. I also have a 2 1/2 almost 3 ft tess he is housed with what was 15 damsels now down to just 2 1 giant starry hermit and 1 smaller starry(they eat the damsels(also finding the damsels killed each other off and the crabs ate the remains) the 2 remaining damsels will litterally swim right through the teeth of my tess several times per day the tess shows no interest what so ever in them.he is fed every 3 days now.this is an eel that was returned to my LFS 3 times for clearing out the tanks he was kept in,was fed goldfish only once in a while.eels are not snakes and should not be fed as such IMO( .I have a 16 yr old ball python) if an eel is actively hunting for food ,feed it .dont wait for it to eat the fish you house with it and then think its a bad fish.its not bad ITs hungry and if you keep them with other fish remember its food to them. they do not have to be gorged to be content a couple smaller meals per week is much healther for digestion than one huge gut swelling meal. you can tell when your eel and other fish are hungry .they will tell when to feed them if you pay attention.