Have you tried an algae scrubber to keep the nitrates and phosphates in check the natural way? Once you have the scrubber, no need to buy algae, no need to by stuff to dose or reactors to fill and stuff to keep them filled. You can feed the algae grown to herbivores. When running at night, because the lights on, helps balance the day/night PH swing, water clarity is better and a cleaner main display from algae including hair algae because the natural algae that automatically grows on the scrubber feeds on those nutrients. Natures way of removing them from the sea. I don't work for them but this is a link to some. They have ones you can hang on glass, or one that submerges in the sump, or if limited on room, one that sits on top of sump or outside of sump and my favorite is the one that floats on top of the water in my sumps on my 400 gallon, it keeps the light contained so it doesn't cause algae to grow everywhere the light would shine like when one grows cheato in a refuge and its quiet. Sorry to hear that happened to you. I get sick losing one thing, to lose so much at one time is depressing but don't give up.
I contemplated an algae scrubber - they are easy to make and not expensive to buy either. However, I ultimately went with a huge refugium. The sump on my tank is 80g so I built it in such a way that if I wanted to, I could easily convert to triton.
It has served me well. I have miracle mud, sand, chaeto and dragon's breath going and it is loaded with pods. I have many fish that depend on the pods as a food source so a large refugium gives them a great spot to reproduce.
Hopefully it will help with the nutrient reduction... and I do the light at night trick too - great for pH stability for sure!!
If all else fails, I do have a korallin biodenitrator. I've never used it - it's sat in the box for a few years. It's a backup for moments like this, but since things can go awry until they are tuned in, and since they can reduce things too quickly, it will be my last resort.
You know- the funny thing is (and knock on wood) - despite the nitrate and phosphate levels, I'm not seeing any nuisance algae in the tank. My tank looks pretty clean. I haven't had to clean the glass since I've got home even, come to think about it. Now that's strange!!
I took a powerhead to the rocks as one of you had suggested and tried stirring things up - there wasn't much to write home about in terms of detritus or food waste. I use 2 250 gyres - honestly one of the best purchases I've ever made. Fantastic water movement!
Other than continuous water changes and (maybe) the denitrator, there isn't much else I can do... It will come down eventually:)
I haven't carbon dosed in a while, but I used to use the red sea Nopox. I guess that's something else I could try if I don't see results, but you're right, natural is always better...