[eyebeatbadgers]

Was the AC your "strong current"?

I've been growing hairgrass for a long time now, and it grows pretty much anywhere, so long as it gets a little CO2. It grows quickly in high CO2 environments.

 

[eyebeatbadgers]

I've been growing it in plain sand for a long time. Substrate content doesn't matter, thought it may grow in prettier in a finer substrate.

 

[eyebeatbadgers]

I avoid them getting the water cloudy by not using them.

Seriously though, dry powdered fertilizers are way more economical and don't cloud the water.