You will have to check out Aquarium Design Group. They used to be the other ADA distributor in the states. They have an incredible showroom and are very planted aquarium specific. I have attached a PDF file with a list of aquarium stores in Texas. It has all the contact info for the stores, and you can find the ones in Houston. I'm not sure how the formatting will work out when I changed it from Excel to PDF.
Also, here are some good BBQ joints in Houston:
Gatlins BBQ 1221 W. 19th, 713-869-4227. Open Tue–Sat 11–7 or till meat runs out. gatlinsbbq.com
Virgies BBQ 5535 N. Gessner, 713-466-6525. Open Tue 11–2, Wed–Fri 11–6:30, Sat 11–5:30. virgiesbbq.com
Leon's World Famous BBQ in Galveston 5427 Broadway, 409-744-0070. Open Mon–Thur 9:30–7:30, Fri & Sat 9:30–8:30, Sun 11–7:30. leonsbbq.com
The Kema Boardwalk is a fun tourist location. www.kemahboardwalk.com
There is also the Houston Aquarium http://www.aquariumrestaurants.com/d...uariumhouston/
Also, Houston has some pretty good seafood. If your inclined check out:
Trulucks 5350 Westheimer Rd Houston, TX 77056
The Cajun Stop on 2130 Jefferson St. Houston, TX 77003
Ragin Cajun on 4302 Richmond Ave Houston, TX 77027
Are both good if you want to try some Canjun food.
If your coming to Texas you also need to have some Mexican food or Tex-Mex depending on who is talking about it. Do not get hung up on the exact description as all of it is good. Here are two I like:
Ninfas 2704 Navigation Blvd Houston, TX 77003
La Gadulupana Cafe 2109 Dunlavy St Houston, TX 77006
As you mentioned Texas is large and Dallas/ Fort Worth 4hr drive/ Austin 2-1/2hr drive or San Antonio 3hr drive are probably too far away for a two day trip. However, there is lots to do and see around Houston. Just be prepared for the humidity, the mosquitoes, and get ready to drive FAST!! The museums and other suggestions are all good ideas too.
Good luck with your business part of the trip, and I hope you enjoy Texas.