Three mistakes = big problem overlooked for too long
Three mistakes = big problem overlooked for too long
When I set the tank up, I did not do water tests for days. I knew the water was entirely from freshly mixed salt. There was no "muck" from the old tank coming in. Any of that was left in the trash can. So the water should be pretty much just like fresh salt. Particularly since my corals were in shock, and should not be taking up much alk, Ca, or Mg.
But to my surprise, when I did test, alk, Ca, and Mg were low! That was my first clue that something was wrong. But I missed it, assuming something was sequestering nutrients, like the dead rock or something.
That was my 1st mistake.
Early on I realized that the section of the sump with the top off level sensors was keeping water at a level several inches too high. Every day or so I'd take water out of the sump until the level was right, and come back the next day to find it at the same level. I'd scratch my head, repeat the water removal, and resolve to fix it when I had time that weekend. Not doing something immediately was
my 2nd mistake.
And finally, it's worth noting that when did my water tests, I tested for KH (alk), Ca, Mg, Ammonia, Nitrates and Phosphates. I didn't bother with specific gravity (salinity) because it was all new salt water, and that is always exactly the same thing. That was
my 3rd mistake.
When I got around to digging into the water level mystery last weekend, I got a sinking feeling in my gut as I realized what might be wrong. My corals were not recovering well, and this could go a long way to explaining why...
When I set up all the liquid bearing tubing in the sump the day of my very, very hurried cut over to the new tank, I made a critical mistake. My
line carrying RO/DI for sump top off was UNDER the surface of the sump water! :eek2:
So every day when I pulled water out of the sump to set it at the right level, RO/DI siphoned in from my RO/DI reservoir. Driving my salinity down day-by-day. The fix took 60 seconds. But my salinity had dropped to 1.016! Oh no!
My system has a DIY switch that flips the source of ATO water from RO/DI to new salt water. So for the last week I've kept that switch on to top off with saltwater. As of yesterday the salinity was almost 1.021. In a few more days it will be where it needs to be.
To add insult to injury, before I'd made this discovery last weekend, I found out that a LFS was having a 1/2 price sale. So I bought some shrimp. Thinking my salinity was 1.025 - close to the 1.024 - that the LFS keeps their water at, I acclimated them in 90 minutes. The next day they were all dead.
