I believe it is illegal to take sand from the beach, but it's also a faux pas to take sand to the beach too; at least that's what I tell friends. HAHA

I would not use playsand as it is silica based and will lead to much brown diatomatic algae as a result.

How big is your fish list? Otherwise I would say you could use the filstar as long as your were ademate about the cleaning. You need rock, but it dry, and use your current rock to seed it. You will also need more flow in that tank. 2 Koralia 4s would be fine with just the puffer. Feed lightly.