Benefits Of Amazonian Frogbit. Cure For High Nitrates?

Just tested the nitrates in my 200l and for the first time since the year dot the nitrates in there have dropped below 50ppm  I'm well chuffed. I did a water change last Friday but in the past a 25% water change hasnt made much difference.

Simon how did you on with the frogbit?

I've been so busy with a new job i haven't had a chance to test.

The Jungle is the jungliest it's ever been.

I plan on giving the tank some TLC over the weekend and I'll see how the Frogbit has done and whether it's made a difference.

I spent an hour trimming The Jungle yesterday and did a large water change before adding the Otos from the quarantine tank.

I was amazed to see how well the Frogbit is doing, where it covered about one fifth of the surface when I added it, it now covers about a third.

I didn't have time to test Nitrates.

I was bemused to discover loads of duckweed too, I thought I was so careful rinsing the Frogbit! 
Oh well, I don't mind, it's green and natural so it can stay.

This morning I realised I'd accidentally nudged a socket and so the filter and heater had been left off overnight.

Temp was 21.2° C so not disastrous. Hope the filter bacteria didn't suffer too badly...