Wait, they'll do special builds and send them out? I bet that costs a pretty pennyGreat news! I just spoke to a technician at Aqueon. They manufacture the 125 G I have on order. I asked about underlayment & he said NONE is required. I said I want to use big rocks for my cichlids. He said: That’s fine! No problem! You can fill that tank up to the top with big rocks if you want.
I suggest you call Zoo Med. I called them once myself on a betta food issue & they were as helpful & nice as this Aqueon man I just spoke to.