Red Bugs, Interceptor and an Unexpected Outcome

Bilk

New member
So a few days ago I discovered I had a pretty bad red bug infestation. Never noticed anything until they decimated one of my corals - a red dragon that had been in the system for almost a year. I pulled the infected coral, dipped it in a white bucket filled with RO water and saw the remains of the little red bugs sitting on the bottom.

So I dosed Interceptor/Sentinal which has milbemycin oxime and lufenuron as active ingredients. First I removed the flavor coating and pulverized 1.75 large tablets in a mortar and pestle and then mixed it into a solution using warmed tank water. This was dosed into the tank after removing carbon and turning the skimmer off. I allowed 12 hours for the treatment to work before replacing the carbon, retruning the skimmer to service and doing a 20% water change.

The treatment appears to have been very effective and the only issues encountered with the dosing were the loss of all of the crabs in the tank and a very active skimmer once it returned to service. It produced a profuse amount of really wet and really green skimmate no matter how the skimmer was adjusted. I was fine with this as I used it as an opportunity to do a good size wet skim water change. Snails and starfish were unaffected by the treatment.

However there was an unexpected side benefit to the dosing - grean/blue cyano that was growing in some areas of the tank, was also eliminated. I mean completely eliminated. I feared that if the cyano was killed off, the nitrifying bacteria may have been as well, but nothing is off from test readings done prior to the treatment. It's been three days now, so I feel if there were any issues in this regard, they would have appeared by now. Is there anything associated with the active ingredients in the tablets, that would wipe out the cyano? It's been pretty well eradicated from the tank.

From reading posts on this treatment, I guess I'll need to perform another treatment in a week and possibly a third thereafter. Meanwhile I've ordered a frag tank to use as a quarantine tank, which should have been the call from the beginning. :twitch:
 
Neither milbemycin nor lufenuron have any anti-bacterial properties. It's hard to say why that happened. Aquaria are complex ecosystems so lots of strange things can happen without clear explanations.
 
Neither milbemycin nor lufenuron have any anti-bacterial properties. It's hard to say why that happened. Aquaria are complex ecosystems so lots of strange things can happen without clear explanations.
Yes I did some reading on both chemicals and get that. It may be a coincidence that the cyano (I believe that is what it was from appearance) vanished during the treatment time, but I don't think so.

The skimmate after the treatment, was very green and I believe the cyano became free-floating rather than affixed to the surfaces they were on - some was around the base of corals and appeared to be starving or feeding off of the corals in those localized areas. It's now all gone including that which was at the base of some corals.

Nothing else was or has changed. Flow and lighting all remained the same throughout the treatment and afterward. PO4 measured less than .01ppm and really close to zero at 3- 5ppb, prior to and subsequent to the treatment and NO3 measures 4ppm and has remained there prior to and after the treatment - this I'm trying to reduce via dosing Flourish phosphorus supplement and carbon dosing.

Maybe it was just an anomaly or coincidence or the blue/green substance was something other than cyanobacteria.
 
So all the crabs were dead, as in hermit crabs? Are ornamental shrimp at risk? And were the fish fine too?
Yes hermits and unfortunately, commensal acro crabs. Anything with an exoskeleton is at risk. It does not appear to effect echinoderms or gastropods. I didn't have any ornamental shrimp, but the two tuxedo stars and all the snails are doing fine. It seems to be hit or mist with the crabs. However it may depend upon the dosage. Others have reported no issues with crabs. Fish are all doing fine and there are no signs of the red bugs in the system. I followed the protocols outlined here in the forums.
 
I may have spoken too soon about the crabs. Though I did observe crabs that appeared to be dead - not moving or exhibiting any signs of life, I'm now seeing some, 5 days later, resume normal activity, after not seeing any movement from them for all of this time that has passed. Maybe they're zombie crabs? :bigeyes:

This is quite an odd thing. I really thought the crabs were goners. I'm not sure if all have recovered, but happy to see at least some are apparently doing ok. :dance:

I'll have to see if there are any macro crabs that recovered as well.
 
Well, cool for you. I however have a pistol shrimp I would love to kill. Can't catch the little turd, and he snips off the legs of out brittle stars, and kills any shrimp we add.
 
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