I beg to differ with the whole idea of slow growers. My two babies went from a skiny 6-7" to a fat 18-19" in a year. Also, I had rescued an emaciated 18"er who grew to a thick 24"er in that year.
I do agree with keeping you tank totally sealed. They are masters of escape. I had mine get into my HOB filters until I dropped the water level a little.
They are great fish, but be careful they don't get picked on. They have sensitive skin, and I hear that once they get an infection it can be tough to cure. I used oral antibiotics for my big guy when he got messed up once and he recovered beautifully. However, this required injecting live earthworms with a oral antibiotic gel.
My little guys were not raised on just bloodworms as so many people do and stunt their growth. They were fed: chopped up defrosted krill, bloodworms, and, most importantly, live red wrigglers (small earthworms). They now feed on whole krill, chunks of steamed market shrimp and tilapia, and very large live earthworms. My one pig will still come over and suck on a frozen chunk of bloodworms, but I think its like sucking on a Popsicle rather an eating an actual meal. These guys are a bit of work with it comes to feeding properly, but they are so much fun to feed and so obviously grateful. All three of my guys greedily hand feed, and flip out with excitement when I come to the tank. My big guy even sticks his face out of the water to try and get a better look to see what I brought him. They are my favorite fish of all the 100+ species I own with personality like friendly dogs.
Mine live in a 180 gallon tank, but I think my 24" would be content in a 120 gallon, but nothing really any smaller. He's an active boy and swims back and forth across the tank when I walk by.
And, btw, it looks like you're my 'neighbor'. I'm just up where Fullerton, La Mirada, and Buena Park come together. You must be 10-15 minutes from me.