I had original packaging still, and took them back to PetsMart. I got merchandise credit card and got the Aqueon (same company as Marineland). I ended up $5 up from the original purchase because they lowed the price.
glad to hear the return went well. Surprisingly petsmart is pretty good with returns (just about the only thing they are good at haha) i had a 36" t8 strip light that was 8 months old and pretty heavily used. I still had the original box and receipt and they gave me all the money back in store credit no questions asked.