The white sand helps with three things... Bugs dont like it much , and dont lay eggs in sand due to the itchyness of the sand. 2nd ... The white (washed) sand reflects light upwards onto younger plants... And 3rd ... It prevents damping off in seedlings. That is why i have a layer of White washed sand over my Medium.

What should i trimm off my plants (on bottom ) ?? Not too sure exactly what to trim ??