I live about 20 mins from marine warehouse and used to go weekly also. I always get helped, but I don't ask for any advice. Some of the employees know what they are doing but they have certain employees for certain areas. If the saltwater guy was not there when u brought your fish in then the freshwater or planted guy most likely doesn't know about how to treat it. I only go there occasionally now, especially for the freshwater selection. I can't find one comparable and most of the fish are in good shape and they will make a deal on a fish that is slightly injured and such. I will say that one time I was in there and was disgusted when I saw a baby lima shovelnose in a tank with about 4 puffers just picking on it at their leisure. I reached into the tank and moved it myself. I have a couple suggestions for fish stores. The first one is called the coral corral.
http://www.thecoralcorral.com/. It is owned by a couple of nice, knowledgable people I know(Craig and Pierre). I would only go during the week when they are there. On the weekend the employees they have I don't like at all. It is hard to find, But worth it. Very cool place and set up with 650 gallon tubs in a warehouse. The second one is also saltwater only. Fish and other itchy stuff
http://www.ichthythings.com/main/. Very knowledgable staff. Not the most personable, but they try. Sometimes it is hard to get service because at night and saturdays they are slammed. They have a good selection of very healthy specimans. Very clean and well kept store. The third is a small store of fresh and saltwater. Countryside aquariums,
http://www.countrysideaquariums.com/. Nice staff: not the most knowledgable, but will try to get u what u want. The last place I mainly go is pets unlimited in clearwater
http://www.petsunlimitedfl.com/. Not extremely knowledgable either, but most of us already know more than the employees anyway. An all around petstore I go to get tortoise supplies and some freshwater fish. Their fish room is dark and u can't always see the fish, But they have a descent selection of freshwater. U won't find anything special or unusual there, but I still go. Hope this helps you out. All these stores are oldsmar\clearwater area.