Thanks for any help!!
Number 1: This one has grown quite a bit in the past 6 months...seems quite happy:
Just a baby:
One of those "Old Men":
1) looks like perhaps a Acanthocereus tetragonus "fairy castle".
2)Looks like perhaps a young melocactus.
3)Think your right with this one, a Parodia leninghausii.
4) Yes again. Cephalocereus senilis "old man cactus"
Is there anything else that number 1 could be?...it doesn't seem to match images that I find....
The others seem to be good to go!
number 1 looks just like my night blooming cereus(spell?) the bats come out at night and polinate them, they bloom at night and blooms fade fast when the sun rises. Worth getting up when it's dark to see!