Aquatic Plant Central - View Single Post - Black rust-like algae formation

Ro_land · 01-23-2008, 04:53 AM

I have a 200liter freshwater community aquarium with a year and a half old setup. In the last two months I found some black/grey formations mostly on my foreground plants, close to the bottom like Glossostigma and Sagittaria (see photos) but also on the wall of the aquarium. A part of it comes off by scraping with the finger.
The aquarium is not overpopulated (few rasboras, neons)
I use CO2 addition, macro (KNO3 and KH2PO4) and micro nutrients with 5x30W light (2x865, 2xOsram Fluora, 1x830).
My test readings are:
KH = 8
PH = 6.85
PO4 = 1.0 ppm
NO3 = 15-10 ppm
Fe = 0.1-0.2 ppm

Has any of you seen something like this? Any ideea?

01-23-2008, 04:53 AM	#1 (permalink)
Ro_land Junior Member Join Date: Feb 2007 Location: Brasov, Romania Posts: 10 iTrader Ratings: 0 Plant Points: 2750	Black rust-like algae formation I have a 200liter freshwater community aquarium with a year and a half old setup. In the last two months I found some black/grey formations mostly on my foreground plants, close to the bottom like Glossostigma and Sagittaria (see photos) but also on the wall of the aquarium. A part of it comes off by scraping with the finger. The aquarium is not overpopulated (few rasboras, neons) I use CO2 addition, macro (KNO3 and KH2PO4) and micro nutrients with 5x30W light (2x865, 2xOsram Fluora, 1x830). My test readings are: KH = 8 PH = 6.85 PO4 = 1.0 ppm NO3 = 15-10 ppm Fe = 0.1-0.2 ppm Has any of you seen something like this? Any ideea?