Wanted to give an unhappy update and cautionary tale:
So I attempted the conversion over to All-For-Reef from Triton Core7. I gather a lot of info from various sources, including Tropic Marin.
I followed the recommended slow ramp-up of AFR, dosing 5 ml AFR per 100 L per day to start with, then increasing that by 2.5 ml AFR per 100 L each week until reaching the needs to the tank. During this time I was decreasing the Core7 dosing to keep the Alk/Ca/Mg stable, with 8/day testing on my Trident, and spot checks with Salifert Alkalinity test once a day or so (which I find more reliable than the Trident).
The first couple weeks went fine. A few days into the second increase in dose (10 ml per 100 L total) I had an SPS colony (Miyagi tort) RTN after I took it out of the tank, had it in tank water with heater for a few hours to clean the area where it was, then put back in the tank. I‘ve done this before fine. I was upset but basically at that point blamed myself, as it completely died over 2 days. Then while it was RTN’ing I noticed a tiny patch of necrosis on a huge Red Planet colony I have, which overnight spread considerably and over the course of a couple days almost completely died. About 1.5 foot diameter colony
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
. During this it also started spreading to small portions of multiple other SPS colonies (none of which significantly died off luckily). It also started to affect some LPS, and I lost a couple heads of my huge hammer coral. Everything else looked pissed off but didn’t die.
During the RTN’ing I was madly trying to keep up with siphoning off dead flesh, keep parameters as stable as I could, aggressive skimming, new carbon in the reactor, 15% water changes every day. I stopped dosing the AFR on the first day that it was clear that the RTN wasn’t just the one colony but was spreading. I didn’t notice upfront, but looking back the pH started decreasing just before I had increased the dose to the 10 ml per 100 L and got significantly worse after the increase. Presumably other things I’m not measuring, like O2, were also getting really out of whack. My guess is that the formate in the AFR that acts as a carbon source for bacteria was driving an invisible bacterial bloom and either directly or more likely indirectly driving the RTN.
Within about 5 days of stopping the AFR dosing (and all the other stuff I was doing) the RTN stopped. I now have a 5 gallon bucket more than half full with coral skeletons. Luckily none of my higher-end corals were affected. Very stressful time for me though.
My take on this is that you should not try to switch a large high-consumption tank over to AFR. Even going slow and following guidelines is dangerous. Starting a new tank with AFR should be fine, lots of people have had success with it. Also, switching a young tank or one with low consumption is probably fine if you go slow.