Vallis turning brown/transparent

[naija]

My planted tank is about 1 week old now and I am currently 4 days into a fishless cycle (dosing with household ammonia). I am weekly dosing Seachem Flourish, and using the appropriate daily dosing regime of Seachem Flourish Excel as my carbon source with a 6 hour period of lighting. I have planted the tank fairly heavily (I think :? ) with Vallisneria spiralis, Microsorum pteropus (on wood), Cabomba caroliniana, Hemianthus micranthemoides and Eleocharis parvulus. Unfortunately the Vallis are now turning brown/transparent and the Bacopa is developing large black blotches on the lower leaves.

What am I doing wrong? Is the Vallis failing because of the liquid carbon, if so is that the problem with the Bacopa as well :?:
Pictures and tank specification below, thanks

 

[gratts]

I've found even small amounts of liquid carbon can be very damaging to vallis. How soft is your water?
Liquid carbon + soft water will give you virtually zero chance of success. My vallis did OK with liquid carbon in very hard water, but anything below that it couldn't cope.

 

[naija]

The water is actually quite hard (approximately 21°dH); so is Bacopa also sensitive to liquid carbon? I read on another forum that if Bacopa's leaves are melting it may be because they were previously grown emergent. The growing tips don't seem to be affected so I may just leave them and replant the tops once they get longer. Should I give up on the Vallis though as I'm sticking with liquid carbon? Any thoughts on Cyperus Helferi as an alternative?

 

[AndyOx]

Hiya, I've grown bacopa with liquid carbon and didn't have any problems but I also grew tiger vallis as well without too much issue either. The melting leaves on the bacopa could well be emersed growth, so I would stick with that one and let it come back, the bare stems will grow side shoots once the main shoot is removed when it reaches the surface. I did find limnophila sessiliflora to be sensitive to liquid carbon too, ended up leaving an awful mess. I was only using it to get rid of some hair algae too!