You're using 2/3rds the amount of light of your old tank, AND the tank is deeper, this makes the light less intense.
It's probably fine. I have some and it certainly curves a lot when it gets close to the light so there's more surface area exposed. If anything, you should just trim the tops of each stem where it's starting to bend and replant them.I just recently set up my 20 gallon tall tank with 2x27 watt pc bulbs sitting directly on top, ferts, and diy co2. I originally had a 7 gallon very long shallow tank with 1x27 watt pc with my plants in it previously before moving to the 20 gallon. My rotala indica grew very fine leaves and grew straight up until it reached the surface and started curving. Now I have a few stems that are growing curved with rather large leaves on it. I know the plant grows differently in different conditions, but is this a bad sign ie too little/too much lighting? Thanks!
You really have an ideal setup for most plants regarding the amount of light you have in my humble opinion. After doing low, medium and high light, yours is in the perfect range provided you provide co2 and nutrients in addition. If you need more resources, let me know. I'll get you some links to read up on.Wow thanks a lot for the information everyone! I never knew any of this before and I feel much better about my current setup now.