Slow plant growth - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 08-04-2012, 10:21 PM Thread Starter
Algae Grower
PTrader: (0/0%)
Join Date: Mar 2012
Location: Czech Republic
Posts: 45
Slow plant growth

I have 20 different plants in my tank and they all grow so slow. Some I trimmed and it's taking forever for the plants to grow and the ones that do grow very slowly have thinner leafs. I have flourite sand.

I have Co2 and 1bp2s. . Have Seachem root tabs, frourish ferts, iron. Do water changes twice a week.
I have 12g Biocube. The stock light is 10000k. Should I add another 10000k or switch those out for 2 6700k?
PhilZ is offline  
Sponsored Links
post #2 of 3 (permalink) Old 08-05-2012, 12:24 AM
Planted Tank Guru
PTrader: (0/0%)
Join Date: Jan 2010
Location: Contra Costa CA
Posts: 11,721
'k' is just what the light looks like to our eyes. It is a blend of colors, and often they are not the same colors that plants use. I'll bet you have lower light than you think you have.

Look into the better bulbs that are designed for plants. Look for the label that is like a little graph with several lines, probably filled in.
The peaks need to be in the areas where plants use the most. There is one peak in the red area, and one in the blue area.
Humans do not see the red and blue so well, so these colors are often missing or not very strong in bulbs for home or office.
Humans see yellows and greens best, but plants do not use these very much.


A light intended for humans is not usually the best for plants, and certainly getting several of the same mistake will not fix the issue.

If all you have to go by is the name of the bulb, and a k number then get a mix of bulbs such as Daylight, Cool White, or Plant and Aquarium. I mix 2 or more of these on my tanks and it is still not enough. The tanks are also near windows, and that helps a lot. any k value in the 6,000 will probably be OK, but get a mix. 10,000k is usually too far into the blue for plants.
Diana is offline  
post #3 of 3 (permalink) Old 08-05-2012, 12:31 AM
Carpe Diem
OVT's Avatar
PTrader: (144/100%)
Join Date: Nov 2011
Location: NorCal
Posts: 7,467
My first guess is that the stock light is not adequate for what you want.
If you want faster plant growth you need more light and of the right kind.

Courtesy * Integrity * Perseverance * Indominable Spirit * and Self Control
Tenets of TKD
OVT is offline  


Quick Reply

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome