Look like dels to me, and endli will outgrow your 72g tank, stick with the dels. And your dark tank should help with the colors. And those prices are pretty expensive, my Lfs sells dels for 20-25$ and I bet they are cheaper else where. Btw dels are awesome, grow big an thick but not too long, and get nice colors.
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My 75 gallon with built in sump and nice black stand, heaters, cover, etc. everything I needed (cept for a new light bulb), only $160 on CL.