not sure what the previous post has to do with this thread, but....
I also worked in the industry for some years.
I strongly agree with Andy about getting work in a store before making any commitments to the grand plan.
One thing people often tend to forget is the day in-day out grind of running a business, greatly compounded when dealing with a perishable item like food or livestock.
It is great to be able to work in a field/area you like, but it is work.
How well will you enjoy cleaning out the feeder tank after the two thousand feeder goldfish you got died overnight?
To be successful in the business tanks need to be maintained daily, throughout the day.
The margins on livestock aren't really all that great, so definitely offer services (service offer the greatest profit margin
And if you do go into the service maintenance side of it GET BONDED/INSURED FOR AT LEAST $50,000
per incident, because they will happen, like the hose getting knocked off the canister filter by the cleaning crew at a dentist office and you get a call that 50+ gallons of saltwater has flooded down two floors of an office building with a hefty bill to go along with it, trust me on this.
All I'm saying is also take into consideration the daily BS associated with this type of business, like nasty rashes from cleaning salt tanks ever day, you know, stuff like that.
It is very easy to romanticize a business such as a tropical fish store, but the realities are a much different story.
don't mean to sound like such an A**, just trying to point out that it isn't all fun and fins.