Angelfish will get to big for a 30 gallon tank. Kissing gouramis ge even bigger, up to 12 inches and aggressive. Serpae tetras and glass bloodfins would both do better in larger schools, and the common pleco will get far to large for a 30 gallon. There are a few dwarf varietys that would be ok. A bushy nosed, or a clown pleco are the first that come to mind. If you stick to just the tetra species, and go for 6-8 of the neons, the serpaes, and the glass bloodfins then the ghost shrimp should be fine. Sorry to rain on your plans.
Sand would work, just be careful what you choose. You need to find an inert one, with a grain size of about 2-3 mm. Anything smaller compacts crushing the roots and creating problems later on. Anything bigger and the plants don't root very well.
Substrate = sand or gravel.
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