Have you always had the same level of flow in the tank?
No, I added the additional powerhead in response to green hair algae problems that I could only attribute to dead spots. I think I will remove it since it hasn't helped with the algae.
Most of the fish are actually really healthy, there are a couple of old ones that I captured in this clip. But they get a healthy serving of frozen (brine shrimp, daphnia, bloodworm etc.) usually four times a week.Some of the fish look to be in poor body condition - perhaps they were like this when purchased?
2 x 29W Juwel LED tubes = 58w total (it's a 240L tank).Perhaps I missed this, but what are the lighting details?
I discontinued all fertiliser dosing about a month ago because the plants were all dying and algae was going mad... But the problems have only got worse since then.That’s a lot of fertilizer going into a closed system with minimal uptake in terms of plant growth
70-80%(I’m guessing 50% weekly water change?)
Yes I think I'll go with 80/20 RO/Tap. I just checked my tap water and it's 480 TDS! I know this is London but surely there's something wrong with my supply?!?!I’d suggest a mix of RO and tap - you might check with London/nearby shops with NICE plant display tanks - what are they doing?