I have vallisneria and java moss, they are both going in the new 75 gallon. I had them in a 29 and a 10, with no special substrate and no special lighting, and no co2. Do I need special substrate, special lighting and co2 for them in the 75 gallon?
Not at all Both these plants do well without proper substrate or co2.
What's your lighting capabilities?
Java Moss tends to grow out darker when in a low-lit tank. And I've always had Vallis and it's done well in all conditions. Although I've recently added a [DIY] 4 litre Co2 generator and the Vallis has grown amazingly quickly since then.