You're doing fine so carry on as you are until you feel the cycle is done. My normal schedule is 10%water change every week however I don't think you need to do any while the cycle is going on until/unless the nitrates or ammonia get too high, or the PH gets too low. The lower the Ph the slower the bacteria reproduce! As you only have 2 shrimps they won't be messing the water enough anyway at this stage, I hope they are still doing well?
Can you take a lower resolution photo, or reduce the photo size on a computer? If you want to email it to me I can reduce it for you
[email protected] - I had to do it often in the past..
Simon