What would be the best I have two T8s in my 40g tank and I am getting decent plant growth but would it be better to ditch that and get two T5s with reflectors of course.
If what you have is working then I'd be tempted not to change it.
From what I understand succesful plant growth in a tank is all about balance. Unless your plants are showing signs of light defficiency at the moment, then if if you increase the light you may also need to add Co2, and extra ferts to keep up with it. Of course if you already use co2 injection and regular fert dosing then I guess your already half way there
Its working I my add another T8 which would be better I am doing co2 injection and regular fert but reading Practical fish keeping is bad because I want to try new things.