As to the lighting if you were to add another 24W bulb that would give you 62W of lighting, and over a 26uk gallon tank that would be just over 2WPG which is mid lighting levels. Ideal for most easy plants to grow adequately.
By full on system i mean a high-tech CO2 pressurised injection kit. Which i saw a price for one in my LFS today at £188. You can get basic ones for about £30-40 which is what i use, or you have liquid ferts at roughly £10 per 500ml which can last a few months depending how you use them. Daily prefereably.
I suppose you could use the air stone for a few hours a day, however it would counter any CO2 you put in, making it useless. So you have to decide if you want bubbles, or plant growth. I know what i opted for, i binned my ait stone few years ago when i got more into plants. Work out what you want to achieve and what your willing to put in to sustain it. Its like saying i want Severums in a planted tank - its never going to happen lol.
Yes, algae can be great, IF you can control it and keep it at bay. I currently have 2ft planted tank which i use a basic AquaGrow CO2 system, i dose ferts 3 times a week using Easylife EasyCarbo and Easylife Profito. My lighting is x2 24W T5HO and on my system it gives me 3.5WPG which is high. Its safe to say i battle algae due to my lighting being to bright for what i grow and dose. I have shrimps which keep some of it in check, but i'm scraping the glass weekly and my rocks are dark green. But i like it, so i live with it. Thats just one form of algae though, in my conditions it could so easily be any algae and others are ALOT harder to stave off, or control.
If you want algae then thats fine, but its a very very fine line between controllable algae you want and algae which is destroying your enjoyment of the hobby. So tread carefully is all i'm saying. Shrimp are shrimp, not gods, even they have limits
