I would say 2. There are a BUNCH of variables that when looked at from different angles can get you different answers. I'de say if you want trouble free I'de personally do 2... Problem is until those things are full grown that is going to be one empty tank......
You have to look at the big picture.... Rays live for MANY MANY years. Ask around on here how long it takes to grow a Motoro to 2 feet.... See what you get for answers. Do you plan on living in that apartment for ther next 5 years? 10? 15? My point is you may be able to throw 6 in there and they may not need a pond for 3-5 years..... By that time maybe you could provide them there pond and get a new set of pups for the tank.......
Keep in mind that there are many different opinions on such a general question.
If I had a 360 wide I'de probobly throw 6 in there.... But like I said I'de just use a tank to grow them, and a pond to keep them.
I have a ray now that's 5 years old and honestly, I see no reason why I couldn't house her in a 180. She's only 15-16 inches across and has a fairly short tail.
Do you see where I'm going with this? It's going to be more up to YOU and how you want to treat YOUR fish. I don't know if there is such a thing as a definite right or wrong answer..... It's all a matter of opinion and personal prefrence.
Some prefer to give thier animals LOTS of room like a pond.... I house 5 rays the biggest being 15-16 in a 8 by 8 pond. Some have a half dozen of the same size or larger in a 450 gallon........
And there are some that say if you can see tank bottom in between rays you could add another..... Pending water quality any of these may be an acceptable answer.
You have to look at the big picture.... Rays live for MANY MANY years. Ask around on here how long it takes to grow a Motoro to 2 feet.... See what you get for answers. Do you plan on living in that apartment for ther next 5 years? 10? 15? My point is you may be able to throw 6 in there and they may not need a pond for 3-5 years..... By that time maybe you could provide them there pond and get a new set of pups for the tank.......
Keep in mind that there are many different opinions on such a general question.
If I had a 360 wide I'de probobly throw 6 in there.... But like I said I'de just use a tank to grow them, and a pond to keep them.
I have a ray now that's 5 years old and honestly, I see no reason why I couldn't house her in a 180. She's only 15-16 inches across and has a fairly short tail.
Do you see where I'm going with this? It's going to be more up to YOU and how you want to treat YOUR fish. I don't know if there is such a thing as a definite right or wrong answer..... It's all a matter of opinion and personal prefrence.
Some prefer to give thier animals LOTS of room like a pond.... I house 5 rays the biggest being 15-16 in a 8 by 8 pond. Some have a half dozen of the same size or larger in a 450 gallon........
And there are some that say if you can see tank bottom in between rays you could add another..... Pending water quality any of these may be an acceptable answer.


That is a lot to think about, and thank you very much for responding!
I might just have to come to the dark side and eventually get a pond! 