Well, local fish shops do not make very much in the beginning (for the most part) or have the longevity that is needed for a profitable business. So, you are putting in lots and lots as a start up with no guarantee that you will end with a profit. Many shops have a loyal basis of customers that stick to their shop. So, if you are in an area with other local shops, it may be difficult to pull people in. Also, chain stores are a big hit on local business. Now, hopefully this will not occur to you. Just saying, it's best to have a back up plan.
55gPLANTED:Rainbows/Loaches/Garras|30gVIV:Crestie|20gL:Leos|10g:Pearl Fighter|5g:Betta|5gChi:Spark Gourami/Badis|5g:ADF|2.5g:Betta|2.5g:Betta|