Shelster said:
Thanks for the reply SLIM
Tank measurements are 92cm long, depth 41cm, height 55 cm. it holds 180 litres of water.
I have a fluval 305 at 1000 lph.
I change 30-40 % of the water on a weekly basis, but must admit I don't feed the plants often at all, as they do grow so well I probably add plant food once a month and use ferropol.
Hi Shelster
Well i can see afew underlined issues to why you may be getting algae.
Il start with ferts. I know you say your plants are growing well but imo its always a good idea to dose trace ferts, ideally daily really.
I know this sounds alot but if your water column lacks any nutrients your plants need, your plants wont be growing as efficiently as they could be, this opens a massive door for algae to take hold.
Ferts dont have to be expensive. You can buy Trace Mix from aquariumplantfood.co.uk, its a powder and you make the ferts yourself.
Its only a fiver and itll last about a year on a tank your size easy, and thats dosing daily. Very good stuff.
Flow.
A 180L tank ideally needs 1800lph flow. This ensures all the plants get the good stuff they need, it ensures you get no dead spots (which is where algae normally attacks first) and the better your flow the harder it is for algae to take hold.
You say your filter is 1000lph? Might be an idea to add a HYDOR KORALIA 900 power head. This will give you a perfect flow rate.
You may need to play with its position to make sure your getting even flow.
Water changes.
Now imo water changes in low tech should be small. No more than 20% weekly. Less even.
Remember in planted tanks Nitrates are not a problem so no need for big water changes.
You see everytime you do a big water change, your unbalancing your waters natual CO2 levels.
This takes your plants some time to adjust to putting your plants at a disadvantage.
Algae adapts to this change very quickly so again this opens a massive door for algae.
The more perfect the enviorment is for your plants, the harder it is for algae to survive.
I forgot to ask about your photoperiod also.
Ideally somewhere between 8 - 10 hours daily. Anymore and your feeding algae outbreak.
Hope this helps