I used to work at petsmart probably about 6 years ago now and I had the joy of cleaning our plant tank exactly like that one out...it looks like your petsmart just didnt bother cleaning it lol!!
Beware it overflows easily if anything gets clogged in the end portion of the tanks drainage section!
And also the spouts, or waterfalls as I call them, fall off very easily and are a nuisance to glue back on!
I think it will be really cool looking as a fuge/frag tank! They really arent meant for the plant tanks because they get clogged up so easily from all of the plant debris floating around!!! And boy do those filter systems stink with plant matter...the memories are giving me the willies!!
Jenna
PS. I am making a stop into my petsmart tonight to see if they are getting rid of their plant tank!!