I am quite sure that with the catfish that he has, and the size that they all get he is planning on an upgrade very soon! His catfish can still turn comfortably, but would be better in bigger accomodations with in the next couple of months!
my 350 gal cattle through pond costed around $135, make yourself a wetdry filter $50 any substrate you might want can be added later! you will want something my two smaller catfish wouldn't eat til i set mine up the way it is now! They have fake plants to hide under and big rocks to hunt behind at night! Total cost should be less than setting up a 75 gal aquarium!
hmmmm, might want to put a liner in there. Not sure if galanized will leach metals! That's a good start though, then later you can upgrade to a 6ft. dia round plastic cattle trough. Ponds are the cheap way to go! Budget MFKs LOL!
yeah i was going to put in a linear i dont want my fish to touch metal...... it used to hold liquids so it will not rust or leak........... yeah you bet im cheap