I have heard rumors that squid spawners work if they are at y: 63. Is this true? (I would rather find out for sure before placing any spawners) Thanks! --Vikki
Well I know in ocean biomes they spawn naturally at about 48-55y and you need a pool of water 3 blocks deep or deeper.
From Minecraft Wiki: "Squids will spawn in 1 or more blocks of water, no matter whether it's a water source or flowing water. The level of light is not important. However, they will only spawn if their spawning block (the solid block underneath the water) is between Y (vertical) level 46 and 62, inclusive." You should also keep in mind the spawning area of a spawner, but it looks like you've already been helped, so I'll lock and archive this.