Hello mate I was just reading through this thread and it seems your having the same issues I am having. As you can see from my photos. I've had none stop diatoms and now cyano but I am getting through it. All I am doing is keeping up with water changes and regular cleaning.
When my nitrates hit 0 the cyano started, I raised the nitrates and carried on water changes. Its a slow process but I think you tank will be in a better position in the long term if you allow it to burn through. The first photo was 4 weeks in and the 2nd photo I literally just took now. The tank is currently looking 100x better than it did 2 weeks ago.
I'm also from the Midlands! So I wish you the best of luck which ever route you choose.
When my nitrates hit 0 the cyano started, I raised the nitrates and carried on water changes. Its a slow process but I think you tank will be in a better position in the long term if you allow it to burn through. The first photo was 4 weeks in and the 2nd photo I literally just took now. The tank is currently looking 100x better than it did 2 weeks ago.
I'm also from the Midlands! So I wish you the best of luck which ever route you choose.