Ive done it without issue multiple times. Get females if you can and try introducing them all at once. My old 110 gallon had a bicolor, flame, a rusty, 2 coral beauties, and a potters without issue. My old 187 gallon had 2 flame, 2 coral beauties, a bicolor, a lemonpeel, a potters, and a nox. My old 380 gallon had 2 coral beauties, 2 flames, a lemonpeel, a bicolor, a potters, a nox, 2 multibar, a multicolor, a collins, and a pygmy. All got along fine.
My current 180 will have a coral beauty, flame, rusty, lemonpeel, and bicolor.
In a 65 gallon, I wouldn't do more than 2, add them at once and get the smallest individuals you can find to help guarantee they are still female.