No minimum ammount required. By staking you earn 6% annual from your holdings, no matter if you have 10, 100, 10000 its 6% of that.
The algorithm, of cloakcoin is still x13? Does this support posmineria?
Yes, it's still X13. Changing from X13 would require a fork. I've no idea what posmineria is and Google seems equally in the dark
teosanru maybe you are from a spannish speaking country?, by 'pos mineria' you mean Pos minning?? if so Pos coins cant be directly mined you stack your coins and win an interest