I'm a big fan of Vibrant and have been using it for 2 years now. Having said that, it's like any other product made for reefing. Not every tank is going to respond the same way. Just because it works for a lot of people does not mean it won't cause problems in your system. I once recommended a reefer to dose 1ml/10g of H2O2 into their system. Most people would consider that a very safe dose. It almost wiped their tank. Turns out they had a heavy metal issue that made adding H2O2 dangerous for them.
Algae pulls a lot more out of your system than just nutrients. It can also concentrate impurities and contaminants. I always recommend running GAC when using Vibrant just to be on the safe side, especially in systems with dino's. It's also important to monitor both Nitrates and Phosphates when using Vibrant. You can either dose them to keep them up or use coral foods if they get low. Since Vibrant doesn't rely on nutrient reduction, this won't have any impact on its effectiveness.
If you were running carbon and didn't bottom out your nutrients I definitely wouldn't consider using Vibrant any longer. Dino's can be a challenge, especially when they are as toxic as yours appear to be, but time and stability can do wonders for a system. Eventually they should clear up on their own as other organisms in your system grow.
Getting away from Vibrant, do you run a refugium or algae turf scrubber?
Thanks! Ya, I just started running carbon in a filter bag in my sump around 2 weeks ago. I haven’t taken it out yet. I plan on getting a reactor but haven’t pulled the trigger on one yet. I just tested my nutrients. While my NO3 didn’t move from when I tested right before I dosed last night my PO4 did take a little hit dropping to .009 ppm... So I just dosed a cap and a half full of seachem flourish phosphorus. Also, an addition 10ML of NO3 (stump remover mixture). It’s crazy because I anticipated this and dosed both an hour before I dosed the vibrant.. Still took a hit. Also looks like my Oregon Tort is a goner. I looked at the underside of it and the flesh is gone.. little strings of it flowing off of it.. [emoji36] Besides the tort and the pearl berry everything else looks normal at this point.. But crazy how they become total losses so quickly..