Hi,
Crypts should be planted with the roots under the gravel but the rosette where the stems originate should be above the substrate.....Many crypts will produce runners UNDER the substrate and pop up all around the 'mother' plants..these will eventually get quite thick.. most crypts can do well in shaded areas but many do enjoy and grow well in higher light levels with c02 and proper fert dosing...
I see you have stems bundled with the lead.. Remove the lead and plant each stem separately or most 1-2 together. They will grow and spread and you can guage the growth.. if packed too tightly they look nice but will not grow well......
Stems should be separated and spaced according to growth patterns and size..
The compakt will do well as any other stem.. stems produce many roots from mid stem and other areas.. these tend to break off and replant elsewhere.....it is another way for the plant to reproduce...
Hygro, rotala, etc share this trait...
You can plant the offshoots as they get larger. If they have roots, secure them in the substrate or move them to another area if large enough...
Hope this helps.