Growing mango tree ........

I saw the instructions on here for starting mango seeds a couple of weeks back. Started four. One of them is showing signs of a little ggroth starting in the seed opening. Should I keep the water level below that opening. The seeds are in full sun , in tempatures up to one hundred degrees most every day. Thank you for the help.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.