those dont look like aefw to me at all. I had them last year. NOT FUN, but I beat them. and my DIP was 1ml Bayer: 1 cup water. there is alot of anecdotal evidence of stronger=Better IMO and it worked well for me. the AEFW peeled off the coral as soon as it hit the dip. add a power head or a baster and they were goners. just have to scrape the eggs.
the aefw I saw were oval shaped and acro colored. the ones you show look like they have two tails and IMO are Planaria. they were on dead coral looking for algae.
as for the tips receding.. what is your alk at? how often are you measuring it? are you doing carbon dosing of any sort? High alk and low nutrients= tip burn.
500ml of biopellets.
.03-.06 phosphate(will test tomorrow)
7.6-7.8 alk( tested 2-3x a week)
Ph-8.1 during day/ 7.8 at nite
Temp 78-79
Lights- 350-425 par
Cal-420(will test again tomorrow)
No mag test
30gallon water change using red sea salt every 2-3 weeks


