• We are currently upgrading MFK. thanks! -neo

Water difference in different countries HELP!

I could not find anything else in my state, and I don’t trust online purchases internationally or even interstate as I’ve been ripped off before.
 
Try reducing lighting to 4-6 hours a day and see what a change it makes. Also test your source water, not just for phosphates as mentioned, but for nitrates, there's been posts on here before with source water that had elevated nitrates already present, so multiple water changes weren't making much difference.
 
Ok, with my British sense of humour let me try a less “joke ridden” version.
The feeding and growing of Flowerhorn is pretty well covered by many “experts” and certainly people who know a damn site more about it than I do, that I can vouch.
However, over the last 44 years keeping tanks (lots of tanks at any one moment) I can pretty much say that 10 hrs a day of decent lighting grows algae pretty well. Better if I don’t have a gravel or sand bottom with plants to remove excess nutrients, nitrates and phosphates.

Brown diatom algae is a frequent visitor in the early days of new tanks and often goes away by itself, but one way to get rid of it is by increasing lighting, but I would say safe to suggest that’s not why you have it.
Glasgow water I would expect to be soft and whilst it could be phosphates, I would probably suggest more likely silicates in the water.
As for the hair algae , that I would expect to be more phosphates based and the amount of lighting with nothing to use them up.

Equally, in my marine tank I have to adjust which light I have and in which amount as certain colour spectrum grow algae better than others. So not only the amount of lighting you have, but the colour / temperature range will dictate if and which algae grow best.
 
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