No prob... sorry I couldn't help further. I hope that you solve your HC problem! Maybe you can at least implement a DIY co2 system. They're pretty cheap to make and maintain but at least you can get 'something' out of it. Usually they're best for tanks 20 gallon and under, but if you use DIY co2 with Excel together, that might be the extra boost your HC needs in its requirements.
Do you know of any links for a really basic explanation to how a CO2 system works? I don't even understand the terminology and before I start thinking about DIY I should at least understand the basics lol