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It only affects certain algae, black brush for instance. And it doesn't immediately wipe it out. It has an impact, but it's not a comprehensive algaecide. Algae eaters - with the exception of the SAE - don't eat black brush algae anyway. I wouldn't be too worried about your algae eater starving...

A couple of very fine questions. 'Ammonia in the presence of light causes Algae' isn't really a theory. The problem is, what do you replace it with? Several pages worth of hand-wringing, which won't be accurate either, and most people will fall asleep half-way through.

Ebayer fluidsensoronline sells dosing spoons, along with a fairly decent range of dry salts, albeit only in 100g bags. There's also a shipping discount if you buy more than one item, which always helps.

It's difficult to answer. How densely are you stocking plants and fish? TPN is probably okay if you have plenty of fish and a fair amount of plants. TPN+ is better if you have little or no fish and lots of plants. For dry fertilisers, see the sticky at the top of this section, titled 'EI daily...

I think TPN does contain Potassium (K), just not very much. This is probably the thread you are referring to.

100g ascorbic acid You should be able to get it cheaper, though. A bakery should have plenty. It's called bread improver.

I'm not sure how relevant this is with TPN, but one advantage liquid fertilisers have over dry salts is that some include vitamins and growth regulators, which can be difficult and expensive to mix yourself. ADA Green Gain has cytokinin, for instance, which costs about 60 pounds for 5 grams.

I thought TPN contained potassium. It doesn't give a breakdown, to be sure. But since TPN+ includes NP, I would have figured regular TPN would be K plus micro-nutrients, just like JBL Ferropol. That way people with fish add regular TPN, and people with no, or little, fish stocks, add TPN+...

Out of curiosity, how do you manage to avoid adding any Potassium at all?