Thanks for pointing to nicehash multialgo examples but i already knew that. The only difference is that nicehash use "f0=?" while on hashpower pass is which algo we are using.. Anyway, just for other users to know i'll post my config file example which seems that it's working on hashpower. This is profit switching between x11,qubit and quark assuming that speed for x11=8Mh/s, Qubit=16 and quark =13.3:

{
"pools" : [
     {
          "name" : "hashpower_x11",
          "url" : "stratum+tcp://hashpower.co:3533",
          "user" : "your BTC address here",
          "pass" : "x11=8,qubit=16,quark=13.3",
          "algorithm" : "darkcoin-mod",
          "intensity" : "18",
          "worksize" : "64",
     "gpu-threads" : "2"
     },
     {
          "name" : "hashpower_qubitcoin",
          "url" : "stratum+tcp://hashpower.co:4733",
          "user" : "your BTC address here",
          "pass" : "x11=8,qubit=16,quark=13.3",
          "algorithm" : "qubitcoin",
          "intensity" : "18",
          "worksize" : "64",
     "gpu-threads" : "2"
     },
     {
          "name" : "hashpower_quark",
          "url" : "stratum+tcp://hashpower.co:4033",
          "user" : "your BTC address here",
          "pass" : "x11=8,qubit=16,quark=13.3",
          "algorithm" : "quarkcoin",
     "intensity" : "18",
          "worksize" : "64",
     "gpu-threads" : "2"
     }
],
"failover-only" : true,
"failover-switch-delay" : "300",
"queue" : "0"
}


If you have any suggestions please write a replay. Thanks in advance.