One gallon, One Clown.

waaaaaaaaay too small
especialy for a tomato, which grows pretty large
 
NO WAY. that is not big enough for a clown fish!
 
Sure you can have a clown in it!

Now, how LONG would you like to have a LIVING clown in it? :)

Just kidding, nope, no clown. The water evaporation alone will kill in in a little while, not to mention the toxic buildup.

Even SW would be really hard to keep in that tank. I'd say:
-Must be freshwater unless you are expert w/ saltwater
-Must be labrynth breather like betta so doesn't have to breathe the horrible, non oxygenated water. A pump would be... shrug, maybe?
 
oh, please please PLEASE dont do what you see in most tanks at the stores, they are just temporary set ups that people do cuz they are bored, and they help sell stuff, most of the time, they are not even set up for a week. at my store there are 3 larger tanks that are actually taken care of by staff members as there own tank, and then there are all sorts of tanks that make me cringe, because it gives people ideas like this, or that they can put 3 angels in a 12 gallon bio cube, cuz we have 3 up front, BUT right now they are babys, and in a week, were gonna put them back for sale. u know what i mean?
 
that is definetly too small for a clownfish. it might be good for a few mushrooms and a cerith or two, but a clown? no way. tomatos need 10G minimum. I would say the smallest SW tank you could have and still keep a fish in it would be 5Gs, and then you'd only have room for 1 goby that doesn't get over 2" in adult size, and some people would even say that a 5G is too small for a 1-2" goby. some might even say a 5G is too small for ANY marine life period.
 
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I'm not saying you should put a fish in it, but my first marine tank was that set up exactly. I had it up and running for about three months before transfering it into a 2.5g. The zooanthid frags that were in it were growing and spreading during that time. I did have to top off daily, but other than that and a 50% wc each week it was fairly hassle free. The idea that you cannot keep a stable system under 30g is IMO an antiquated notion. Pico tanks can and do work long term if properly maintained.
 
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