[JDM]

First, remove the driftwood to see if it is, in fact, the culprit.

What did you use to clean it with?

With your KH being on the low side the pH can be lowered easier even if unintentionally.

Jeff.

 

[JDM]

You know, with the fixture you have you could easily stock some low to medium light plants in there. The water is just hard enough to support them as long as you don't try valls. A bunch of crypts would go nicely and some real amazon swords.

Just thinking out loud... the tank looks great without but I really like plants... so I like to suggest them.

Jeff.

 

[JDM]

Man I would really like to get some live plants in the tank. I was actually researching last week what I could get but I assumed my lighting was not sufficient. Also the more I researched the more "complicated" it seemed (special substrate, co2 injection, fertilizer, etc.).

I'll look into these for sure - thanks.

Check my tank in my profile.

Marineland double bright, seachem's flourish once a week if I remember, a root tab for the sword. I have tried a large variety of plants and only the most light needy don't do well.

That's about as complicated as it gets. You don't need CO2 unless you are really cranking out the light intensity, special substrate is marginally a benefit, depending on which one, not a benefit at all. Fertilizer... solid ferts can be a benefit but in a lower light low tech setup not really needed. Your tank is already cycled so you aren't worried about having enough to replace the cycle.... great time to play if you are considering it.

Get some crypts, sink them in the substrate and see how they do.

Jeff.