| | Having a few issues. Need some advice
I seem to be having a few issues with a few plants in my all-glass 75gal low tech tank. My straight Val is still hanging on, and it's still real green near its base, but it's producing new leaves very slowly, and shortly after, the newly grown leaves are dying and decaying. I'm seeing similar things from my hornwort too. It is growing, but about a 1 foot back from its new growth, it's turning pale, and having a hard time keeping boyancy. However, my corkscrew val seems to be doing great. It's producing runners like there's no tomorrow, and it's green, full, and hasn't had any leaves decaying. What is causing my problem?
This tank has a twin tube 48" all-glass strip light. With 1 40watt penn plax aquari lux T10 tube, and one Phillips colortone 40watt T12 tube. 80 watts total.
No CO2, PH = 7.8. I haven't run any other tests, but our water here is very hard and alkaline. Flourite substrate, no ferts added, weekly 10% water changes.
I'm not interested in cluttering up my setup with CO2 injection. I'm happy with slow growth. As long as it's steady progress.
Thanks for any help,