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But catsharks don't need to move constantly to survive.Most of the time they are on the bottom resting or in caves searching for food.So a 180 seems fine for a non pelagic shark like a catshark.
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Originally Posted by
sweatervest13 http:///t/396205/what-fish-to-get#post_3529510
Lets say a person who is average height (5' 10" for an adult male living in the US) lives their entire life is a room that 11.5' x 17.5" room. They should be okay. The room is plenty big for them to walk around. But now imagine that the person needs to constantly be moving to stay alive. The room starts to feel a lot smaller and cramped. The name of the game in this hobby is not: What is the least amount of room I can give my fish to keep them alive? It is: How can I (you) provide an environment for my fish so that they can thrive and live a long life?
When all is said and done the choice is up to you. It will be your tank, for good or for bad. You are the one who needs to put up the time and money to get this up and running not anyone else here on this site. This is a place to come and ask questions from people who have some experience and maybe came across something a new hobbyist has never experienced. You have started multiple threads asking the same questions and trying to reword things so that you get the answers that you want to hear. Which is fine (can't blame you for your enthusiasm one bit!!!), but the members here will give pretty consistent answers. Certain fish will not mix well with others, some fish have special needs with regards to tank choice (size, substrate choice, flow, temp, rockwork, swimming room). It won't change if you reword your question.
It seems that you want a shark and ray, or some other aggressive fish. A 180g tank is on the bigger side, and could be a pretty BA aggressive tank. Why not take a look at some other aggressive tanks and see what kind of stock lists they have and if they have been successful keeping them long term. I will say that my LFS usually is housing a reject from a system that it outgrew or was too aggressive for.
Your tank... Your choice. Good luck with everything.
My suggestion would be to look for cheap equipment on CL. That place is packed full of hobbyists that have grown tired of the hobby or found it too hard to maintain a SW system (not that it is difficult to keep a SW tank going, its just some people don't make good choices and get super frustrated when the tank comes crashing down). You can often find someone who spent thousands of dollars setting up a large system who is selling it off for pennies on the dollar. The usual rate is about 50% of the purchase price or less. Usually big tanks will cost about $1.00/ gallon (not listed price, but can be bartered down to a buck a gallon).
Again, Good luck. Keep us posted on the tank setup.