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You have 90 Watts of LED lighting? My entire house has less with every single light on!

Looks like it's struggling to me, not enough nutrients?

Do you think those tiny bubbles are contributing to the DOC? They're not dissolving as far as I can see, and not disturbing the surface of the water enough to do anything at that level.

It's electrolysis... Literally a voltage is applied across 2 pieces of mesh that are spaced slightly apart. The current is flowing through the water inbetween the 2 pieces and molecules are ripped apart. Bear in mind it's not producing 'pure hydrogen and oxygen' as keeps being stated in...

What nitrate source are you using? What test kit?

I've seen this discussed on the internet before with many nay-sayers claim the water from the tumble drier will be full of bleach and various chemicals you do not want in your fish tank, but the water from my tumble drier does not smell of any perfumery nor bleach. It has a TDS of 5 ppm which is...

As an update to this, I had only recently put the Hygrophila polysperma in the tank to fill out space - it was cheap and I heard grew like a weed. This was growing, but all of the leaves were coming out bleached and distorted, yet there was a stem at the back of the tank which was growing...

Thanks, I've had the drop checker in every corner of the tank and it's lime green everywhere, I just got sick of it blocking light from the very front corners so moved it up seeing as it wasn't telling me anything new. I'm pretty sure flow is good, the filter is massively over-rated for this...

Thanks for the advice. Here is a full tank shot. There were more plants than this, the right hand side was actually quite filled out originally but got full of the hair algae and I cut it all back last week with the intention of propagating some stem plants into there if they ever grow enough to...

I set up a new tank around 5 weeks ago now, it's my first planted tank, it's not gone smoothly really. The specs are: 42 litre tank CO2 injection from fire extinguisher (drop checker lime green throughout photoperiod), goes straight into filter intake 6 hour light period, Chihiros A351 light...