Who Gives A Fish Forums

I think I know what you're dealing with, the dark green/black stringy algae stuff. It's actually quite common and can be a real pain. I've had it before too, and it's usually a sign that your plants are struggling to absorb nutrients from the substrate.

Firstly, I'd recommend checking the nutrient ...

I'm pretty sure it's the Flourish Excel, it's known to be toxic to Jungle Vals.

I'd say change the water and do some research on the nitrogen cycle, it might help Frank feel more comfortable in his new home.

My yellow labs just had babies, fingers crossed my male was mature enough to do the job.

Black Diamond blasting media's a pretty affordable option, around 8 bucks for a 50-pound sack.

I've got a similar setup, just 1 inch of natuflake gravel and river cobbles, no specific planting substrate in sight.

I've also had success with Ludwigia and Wisteria in my low light tanks, they've grown really well for me.