i dont think there will be an issue - i have heard 134's being bred in the ph range of 5.5 to 8.5 and temp from 24-30 degrees celsius....
just be careful moving them from one extreme to another without giving them ample time to acclimatise... especially with ph... going from 5.5 to 8.5 will more than likely kill them from ph shock and same from 8.5 to 5.5...... temp not so bad.. going from 24-30 and vice versa.....