Re: Cardinal Tetras...looking for advice... BL,
If you want the plants to do very well then feed them.  I had planted discus tanks for about 6 years prior to having my reef tank. If you have a co2 reactor use it on the planted tank and your plants will explode with life. But be cautious as you probably know injecting co2 will have an effect on ph.
I love planted tanks, sometimes I miss it when I see old pictures of it. But when I finish my basement I will be getting another tank maybe a reef or maybe another discus tank.
Sean
P.S
I too like cardinal tetra's, but it was always very difficult to find good quality specimans.
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90 gallon reef, mag 1800 main return pump, 10 gallon refugium + 10 gallon sump, CPR overflows, ASM G-1 skimmer, icecap 660 vho 440 watts. 130#LR and 60#LS. Corals: Finger Leather, Fat Finger Leather, Toadstool, flower pot sps coral, hairy mushrooms. Fish: Yellow tang, Bi-color angel, pecula clowns, royal gramma, coral beauty angel, yellow tail damsel, blue damsel, Sergeant Major Damsel. Misc. hermit crabs, snails, flame scallop, Xenia |