Thanks.
I seem to be doing too many water changes to keep algae in check, I'm doing 2x 50% week. I had a problem months ago with holes in the leaves which I addressed with k2so4.
Algae I'm experiencing is green spot algae, green dust algae and a find of small hairy algae looks grey, doesn't grow in clumps like BBA, it grows round the edges of old leaves.
I have ordered some hydrogen peroxide to clean leaves.
Would you say I should therefore increase nutrients to combat algae?
2 X weekly water changes is only "too many" if you want to do less, in which case you should feed your fish less or just keep less fish in the tank
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Hydrogen peroxide is only going to kill algae that you squirt it on, it will not stop algae growing back on the leaves, in fact it could damage the leaves and will certainly kill any beneficial biofilm on the plants leaves, so the algae will just grow back even faster than it did in the first place. Personally, I would remove any leaves that are totally covered in algae, and just let the plants/bacteria fight any small spots of algae on other leaves . For the glass and hardscape, just scrape using a Stanley blade or toothbrush, this is far more effective than the peroxide.
I would not say you should increase nutrients to combat algae, you are dosing EI, which means that you are already dosing the maximum amount that plants can theoretically use. Dosing more wont either hurt or benefit your tank, you'll just need to buy more fertiliser sooner.
Remember algae is natural and healthy, it will always be present, especially in a "low tech" non -CO2 tank. The only practical way to control it in such a tank (other than physically removing it and assuming there is no other major issue with the tank) is to adjust lighting levels and make sure the plants have enough other nutrients (which dosing EI covers).
If you feel like you are doing "too many" water changes to keep algae down, try lowering your lighting intensity instead maybe?