filled tank

I have a 220-gallon aquarium and have managed to get past the initial challenges and learning curve. Everything is mostly automated now. I'm looking for larger corals, but have hit a bit of a dead end in this area. Everything I find seems to be just a drop in the bucket. I would like to find...

So, it is bound to happen to all of us, eventually, if you have an old tank in operation. This happened on my old LeeMars 125 gallon that I have had for many many years. Acquired new bout 20 years ago or so to be sort of exact. This happened the day after I returned from a 10-day absence while...