WPG and CO2/no-CO2 in Smaller Aquaria - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 08-13-2005, 04:06 AM Thread Starter
Guest
 
PTrader: (0/0%)
Join Date: Aug 2005
Posts: 36
WPG and CO2/no-CO2 in Smaller Aquaria

Is there a good guideline for how much light is too much light for smaller non-CO2 tanks?

I have read about sucess with 55W over a 20H with just Flourish Excel while in the lighting forum someone said that 65W over a 20H requires at least DIY CO2. Is there really such a fine line?

At what level of light will algae control be impossible?
The Snowdog is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 08-13-2005, 11:59 AM
Guest
 
PTrader: (3/100%)
Join Date: Oct 2002
Posts: 4,939
Thats a tough one because WPG in smaller tanks can be achieved in different ways.
I will say this...if a single bulb's "intensity" is high as opposed to using two lower watt bulbs to achieve the WPG then you may need CO2.
BTW...CO2 is beneficial in all aquariums...it is a just a necessity in high watt tanks.
Example...
1 - 36W Compact
2 - 18W NO flouro's

...both add up to 36 watts of light but the growth rate and demands will be much higher with the single compact bulb through intensity and you can grow more varieties of plants...
Buck is offline  
post #3 of 7 (permalink) Old 08-13-2005, 08:04 PM Thread Starter
Guest
 
PTrader: (0/0%)
Join Date: Aug 2005
Posts: 36
I guess a better way to word my question is: At what light levels does the low-tech method start to break down for smaller tanks?

Let's stipulate that we have three PC bulbs to pick from (36W, 55W and 65W) and a 20H aquarium. Could you sucessfully do a low-tech, no-CO2 tank with any one of those three bulbs?
The Snowdog is offline  
 
post #4 of 7 (permalink) Old 08-13-2005, 09:35 PM
Guest
 
PTrader: (0/0%)
Join Date: Oct 2002
Posts: 1,614
light drives the plants

Because light drives the plants, causing them to require more nutrients (N, P, K, , traces and Carbon) you have to give them that or else they will fail in one way or another.

I had a 20H with 55 watts and very low input of DIY CO2 via a gelatine mix and it was fine. It was also very overstocked with fish and I worried about it a lot when power went out or the tank temp got high. The same tank with 36 watts would have been less of a concern and probably would have been fine with Excell and no CO2.

But, you can lower the lighting by adding driftwood that stains the water, by letting the glass get dirty with water splashes, by raising the light up a bit to increase distance. Or replacing the bulb, for many ballasts can run 55 or 36 watts (but check with someone who knows for sure!)
anonapersona is offline  
post #5 of 7 (permalink) Old 08-14-2005, 09:22 PM
Planted Member
 
PTrader: (0/0%)
Join Date: Nov 2003
Location: SE PA, USA
Posts: 194
I have both a 29 and a 20 L at 2 wpg. Both are doing fine, and neither has injected CO2. However, both have soil substrates and the 29 has Excel added three times a week to control BGA.

I have a 10 with 1.7 wpg and no extra CO2 and some of the plants are doing great. But some aren't.

Bill
aquabillpers is offline  
post #6 of 7 (permalink) Old 08-15-2005, 12:22 AM
Guest
 
PTrader: (0/0%)
Join Date: Mar 2005
Posts: 70
I have used all three bulbs in 20gal tall tanks without CO2 as well as with CO2. I find with 20gal tall tanks its more of light penetration then w/gal. What I mean is I run two 20gal side by side with a All Glass 48" CF 110w/ These tanks are low tech. I only use Kent Pro Plant. Take the same take with 55w cf with AH reflectors and the tanks will need some kind of CO2 injection to balance the CO2/ watts/gal. When setting up light/penetration its a balance with CO2. IF you keep 2w/gal with cheap reflector your CO2 demand is lower then using very good reflectors.

Hawk
Hawkeye is offline  
post #7 of 7 (permalink) Old 08-15-2005, 12:53 AM
Guest
 
PTrader: (0/0%)
Join Date: Jan 2005
Posts: 160
I had a 20h setup with flourite substrate and 130w of CF (coralife 65wx2 aqualight deluxe). I could not control algae without the Co2. It was just a necessity! Now on the other hand I had 2 18w NO's over the same tank before the CF fixture and had absoultely no problem with algae. I did however have a problem getting anything to grow in there 'cept for some crypts....
frmrreefr is offline  
Reply

Tags
None

Quick Reply
Message:
Options

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

Password:


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

Email Address:
OR

Log-in










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