I would recommend a 4ft tank, roughly about 240 liters of water.

As with most hobbies, the initial layout can be expensive. So the long and the short of it, yes it can be expensive based on which type of system and size. But again there are ways to work around this.

We are dealing with livestock and the necessary precautions need to be taken like water parameters and quarantine. I know of hobbyist's that had particular fish that are twenty-two years of age and still going.

Yes, you can find good quality products for the right price if you know where to look.

That would mostly come down to the light unit, depending on the size of the tank and which light option you opt for.

Very important and one should familiarize oneself with understanding the basics of marine keeping and water parameters.

This is not an easy question to answer as it depends on the size of the fish, the species, and aggression factor, also keeping in mind that some can outgrow their tanks.

No, many fish like your angels, and butterflies in particular eat corals.

No, we have specialized salt manufactured by professionals that we use in the trade.

Yes, most animals in the trade come from tropical regions.