Hi,
OK, well it's always a good thing to remember that things don't go out of control because of adding ferts, only due to not adding ferts. Therefore the mindset should always be "How much ferts do I need?"

Crypts don't grow at the same speed of some of the faster stems but by no means are they slow growing plants. The same can be said for most of the plants on your list. Lowering the light will slow their growth, but in order for them to grow at all then their nutrition must come from somewhere.

It's possible to have the nutritional requirements supplied from a combination of the substrate and the fish waste alone. I don't have a feel for 65w CF on the 46 G because it's hard to quantify the contribution of the fish waste. Also, having reflectors changes the light energy input versus not having reflectors. With a nutritious substrate and normal fish loading you may only need to add a pinch once or twice a week. As I mentioned, adding CO2 changes things quite a bit, even under lower light so you may need to dose more frequently. I forget the numbers but I think Tom estimated that adding CO2 can increase the growth rate by 2X-5X even in a lower light configuration.

Because of this uncertainty, the best approach I've found is to dose the standard EI amounts or, say, half the standard amounts and then slowly back off the amounts that you add at three week intervals at maybe 50% dosage values. If you start to see signs of deficiency then go back up to the levels you used prior to the deficiency.

For example lets say you start off dosing 1/2 teaspoon of KNO3 3X per week and everything seems fine. After 3 weeks, if there are no nitrate starvation symptoms drop the dosage to 1/4 teaspoons 3X per week and see how that goes for three weeks and so forth. If you had dropped to 1/4 teaspoon and then you started to see BGA within that 3 week trial period then you know that 1/4 teaspoon is too low. It indicates that your proper dosage is perhaps somewhere between 1/2 teaspoon and 1/4 teaspoon.

You can do the same exercise with KH2PO4 and with the trace mix, more or less working your way down to zero. If 1/4 teaspoon 3X per week works OK then try 1/4 teaspoon only 2X per week. Then only 1X per week assuming no problems. In this way you will be able to determine what works for this particular tank configuration.

No one can predict whether you need to dose or not because only you have your particular configuration. In fact you may have tap water high in nitrates and or phosphates so you can get away with not dosing while someone else's tap water may be low in these nutrients and they can't get away with not dosing. It should not be surprising if someone else gets different results using the same setup and technique.

Hope this helps.

Cheers,