Hey guys hopefully everyone won the battle against black bugs.
I too had them last year and lost a lot of corals, not only acropora btw. Anyway, i also tried doctor G's and it seemed to work but after a few days to a week the bugs were back.
The only thing that worked for me was "interceptor" pills for dogs.
you might have to sweet talk your vet for it though and also it has a different name now . or find it online somehow, there's an article on "melevsreef" on how to approach this.
the only thing is that black bugs are resilient mofos. so i ended up having to up the dose by 10
times. this will annihilate all inverts and all copepods in your system. and basically anything on live rock. to be followed by an outbreak of green hair algae. This seems to be an indication that the interceptor did the job. i know it sounds drastic but its worth it when everything is dying. i remember before i tried this i was ready to tear down the tank after battling the bugs for over 6 moths.
if anyone wants to try this, remember to remove all inverts you don't to kill.
if you want to make sure. repeat the process after one month!
and then re seed with new copepods.
this is the instructions just multiply the dose by x10
https://www.melevsreef.com/articles/red-bugs-no-more