Can you adjust brightness? I thought you mentioned in the original post that you had a Satellite plus, which would be used for the single color accent. If it's not a Sat+ Pro, you might not be able to try that either. In that case, my only cheap non-DIY suggestion is trying out "Marineland Red Accent Hidden LED System" as they're going out of production and are $20 each instead of $50. The issue I see with that option though, is that it uses deep red 660nm LEDs, which are only 1/3 the brightness (to your eyes) than the typical 630nm LEDs. Combine this with the low power of the LEDs (72x 0.06W), they're only equivalent to a couple of red 3W diodes.
I don't like recommending DIY to people who would rather get pre-made, but it might be the best option to get your red-boosting accent light at 36". You could get RapidLED solderless LEDs and driver, and a 36" stevesleds HD heatsink, and assemble everything without any soldering. I'm not sure how much It'd cost to ship to canada, but it's $32 for the heatsink, and $65 for the LEDs before shipping. The led mix would be 10 standard red and 3 standard blue leds.
Another option is to get some aluminum C-channel from your friendly home improvement store and slap a few rows of RGB led strips on. You'd get 5 rows if you buy the typical 5m strip, and that should get you enough red (plus some blue and green; you can experiment) to at least see if more is worth pursuing.
I use the Fluval for the main light, it does all the heavy lifting. Average 100+ PAR @ substrate level.
I use a 50/50 cool white / actinic blue 15 watt modular strip for helping counter the yellowy look of the Fluval.
I was, not anymore, using a 24" Sat+ non-pro "just because". The reds on it are horrendously low powered.
After diving in deeper, testing + measuring things, I am not reaching sufficient CO2 levels nor am I getting the most out of my ferts, so I am going to tackle CO2 and ferts first, look for a response and then possibly look into lighting.
For CO2, I am going to go ahead and opt for a much larger filter, pump more CO2 into the reactor and make sure I keep it at suffiencent levels throughout the photo period. This will also help with flow in the tank, I am noticing some dead spots as the filter ages + more plant growth.
I just fixed a few issues with my auto doser, so my ferts "should" be up to spec for the time being (until I inevitably roll my own blends).
I'm with @OVT
on this one, I want to see if "over the counter" common LED's can get some nice reds. I can't see this tank being torn down for a while, so I'm excited to see what I can get out of it.
I will look up that Marineland one tho....