SLOW1, welcome to MAAST & the hobby! It's like a drug and it will keep pulling you further and further down into it's clutches.

I like your tank, and judging by the way your sand has shifted, you seem to have a good amount of flow!

The only advice I'd like to give you is get some good test kits and take it slow. Patience is hard in this hobby, but patience has rarely ever nuked a tank. :-)