Many complicated reasons involving priorities. In am oversimplified nutshell, though, because I like the dog better than the fish tank! He needs some very expensive ongoing medical care and attention. Something had to give or I was going to be in the poorhouse.
I miss the big tank and my breeding pairs, but Angus has been 100% loyal and faithful to me for many years, and I feel confident I made the right decision. I have many more years to have a big fish tank; I only have a year or two left with him.