Join Date: Jan 2007
Location: Québec City, Canada
Do I need to fertilize?
I've done a lot of changes to my 10g tank lately, among these was to upgrade the lighting, a lot, and I am switching my substrate to Flourite.
Since then, the plants have been growing more, and faster and producing oxygen like mad. (Still love to watch the bubbles under the leaves. )
But with the growth spurt, there has been a drop in the nutrients. Specifically, the nitrates and phosphates were almost 0 last week when we tested. This week, 0 phosphate and approx 3 nitrate ... though that's probably to do with all the organic matter I stirred up when I changed the gravel.
At the same time, I've got a pretty big problem with green hairy algae ... so I don't want to add ferts if it'll just cause an even bigger algae bloom.
ATM I have 1x26w and 1x13w CF lights and I dose with an iron supplement and Flourish Excel. I have 4 platies, 1 oto, 1 small catfish and 5 Amano shrimp. It's planted with Hygrophila polysperma, crypt wendtii and some java fern.
Do I need to add NPK ferts? Will my plants to OK without them? Will letting them get so low reduce algae growth ... or make it worst?
Also, I've heard that an overdose of Flourish Excel will kill algae ... How much of an overdose?