Thanks for all the responses everyone.
I could add more iron and potassium easily enough. I used to do two smaller water changes a week instead of one larger one and added 5ml Flourish each time. I don't have time for that anymore anyway but what I found was that the plants liked it more than one larger change but it was harder to keep the nitrates down. So better for the fish but not the plants, especially the crypt nurii.
I did notice before that when I was treating the tank with paraguard the plants had better colour and thought that it may have been because they were using the aldehyde in the paraguard as a carbon source.
So I thought that maybe Excel would help, but I'm not feeling the need for plants to be red bad enough to invest in large amounts of it.
I have some Alternanthera reineckii 'Mini' that is sort of peach colour on the bottom of the tank and where I've been collecting all the stray bits floating around in a breeder box that is right at the surface it is brighter pink but not the rich red it always is in pictures describing it. That is another reason I thought that adding some excel might help; because being close to the light was not enough by itself to bring out the colour.
Maybe what I'll try first is adding some time during the lighting periods when both lights are on at the same time to up the intensity a bit and add a second dose of Flourish midweek. I'll see how the plants respond to that and adjust if algae or deficiencies indicate that I need to change lighting or add more ferts.
A few anubias leaves are yellowish and a few have the darker veins that I think is magnesium shortage but they may have been formed from a period of tank neglect a few months ago while I was not as consistent with water changes.
Does Flourish have enough iron for this, or should I be dosing iron on an additional day(s)?
I generally use Seachem products for ease of use, but is there some other brand I should look at as well/alternatively (I don't want to get into mixing my own ferts from dry though).
Am I understanding you correctly...does Hagen have a one bulb T5HO fixture ?
And you only have one T5 bulb on at any one time ?
I have one T5HO bulb on my 10g tank @ 12" above the sub.
I use the regular EI list, but only one dose of it and I do
add more Potassium and Iron. I am also dosing Excel @ 2x the recommended dose.
The "red" plants that I have(Rotala Magenta) are very small yet but the bigger they
get it seems as though they are trying to have some red at the very top of them.
In the past couple of months the new leaves that are coming out are red before
they reach full size but then turn back to almost green.
Keeping my fingers crossed that after they reach the top color will be better
especially on the new shoots those send up.
Yes, I have two single bulb fixtures and usually only run one at a time but will experiment with two sometime soon.
Really the biggest driver of color is light level... but to have more light, you need more carbon... High tech is the king of that approach.
You might be able to get some more color out of the tank with a bit more fertilization, as iron is another typical limiting factor in color.
Under PPS-Pro dosing you would dose 7ml of the flourish every day, and under EI low light you could dose 15ml once a week with a 50% water change. Both of those are optimizing it for iron.
The form of iron in Flourish (ferrous gluconate) is one of the most readily absorbed, but also the least stable. Thus, if you do increase dosing, I'd suggest adding a second 5ml dose half-way though the week if you can, rather than one larger dose..
There are other tricks to squeeze out more color, but these involve using deficiencies to weaken the green color of the plant, causing the other colors to show through better. That's not really healthy for the plant, so I don't suggest it.
Do you have a link handy for a basic explanation of PPS-Pro dosing. I've heard of EI but not PPS-Pro.