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Try upping your phosphate dosing a touch, that should take care of the gsa.

I don't bother either, syphon into the back garden and fill up straight from the hose. The theory is that unstable co2 = BBA. I'm not sure I agree with this in a low tech tank mainly due the fact the plants aren't adapted to higher co2 so the fluctuation caused by a water change has nil effect...

Exactly the above. I know it will be some serious work (been there got the T-Shirt) but bulking it out with some fast growing plants and adding soil will definitely help. I think with the size of the tank and given sufficient plant mass two tubes would be acceptable. This was single t5 no...

Just the basics: Size, lighting, filtration, wc schedule, stocking etc. If you're no longer getting new bba growth something you've done must be working. Also an FTS would be nice.

I do recall the tank and very nice it was, sorry to hear about the light unit failure:(. How ever I would still suggest that both your tank and Darrel's are med-low light despite the actual intensity being provided due to the use of floating plants and in the case of your led unit the height...

First of all please define high light(our opinions may differ). If you can please post par values from your tank. Also I'd like to see some pictures of the tank. (I'm a low tech guy too and love to see others work)

They didn't attempt to lower the co2 compensation point, they found the minimum of both light and co2 and increased them from there. I'm not saying high co2 and low light will give you better growth than low co2 and higher light. Their experiment shows it doesn't. They don't state about any...

I'll let him answer for himself but from what I've seen he uses alot of floating plants and very thick growth to keep the light levels low for his fish and is accepting of a certain amount of algae.

Keyword.... May. Also it seems to suggest it's limited to certain species of plants. Assuming it's possible(I'm not say it isn't), I don't see why this would be a desirable condition to attempt to achieve in the aquarium as it would result in too little wiggle room.

Not my understanding of it sorry. Light is always the accelerator, plants have a coping mechanism for dealing with lower levels of co2 and adding more light will just get you closer to the point where the plants won't cope but just before you get there your plants will grow well. Adding co2...

Not quite correct, addition of co2 lowers the light compensation point of the plants allowing them to grow with less light.

Otos would be a better choice than the bn. Imo 50l is too small for a bn, it'll be okay while it's small but it will get big.

O2 is much more difficult to dissolve in water than co2 (tom barr has used it in the past) also compressed or liquid O2 is incredibly dangerous and requires specialist training before use.

Add loads of light to your tank (midsummer sun) without upping co2 levels. No amount of nutrients will save you. As darrel says about the green water dying off in autumn once the PAR levels drop, the nutrients are still there its just the conditions no longer favour algae growth. It would be...

Also get half a dozen nerite snails they will keep the rocks sparkling.

You still need to dose macros. Im a thames water customer (assuming you are too) and the water report shows not alot of nitrate or phosphate just very hard.

Algae will survive/thrive on a fraction of the nutrients required by plants so no issues there. As for benefits of it...... well some species of fish benefit from an algae based diet.

Had what sounds like a similar problem in my tank it looked really bad only way I could get rid of it in the end was a 50%WC and used Nutrafin Bio-Clear :oops: Regards Ollie