So you have made the decision to grow live aquatic plants in your Aquarium. That is indeed a great decision for 2 reasons...
1) The beauty that live plants provide...
2) And the improved health of an aquarium that the live plants provide with proper care.
Not only will you find that your aquarium takes on a more natural look, but you will also find that your fish behave in a more natural manner.
At this point I am going to assume that you already have the basics on keeping tropical fish and are adapt to the basics of maintaining an aquarium.
What I intend to do here is fill in the blanks to give you the best start to growing beautiful plants for that aquarium.
The 3 Keys To Success...
Quality Substrate, Good Lighting, Good Nutrition
The term Substrate refers to the medium that the plants will root in.
Just like your house plants, what you "plant" them in can be very important because that is where many varieties of plants draw their nutrients from.
When choosing your substrate you must consider the types of plants you are interested in growing and know their needs. There are a few varieties of plants
that could care less what the roots are in because they get very little nutrition from the roots and only use their roots to anchor them whereas other aquatic
plants rely heavily on the root systems and a quality substrate for nutrients. Later on I will list some varieties of plants that need a quality substrate and some that do not.
The most common mistake made by beginners is to get the cheapest gravel they can find and a month later we ask ourselves why the plants are not growing well. A good quality
substrate can be costly but will pay off in the end. All plants need a supply of Iron (Fe) to grow. Substrates such as Flourite and Eco-Complete provide a long lasting supply of
Fe to the plants through the roots. While each of these products can be costly per bag to buy, it provides you the best start to growing nice plants. I personally have used both with great success.
Plants "will" grow in your average aquarium gravel but the size of the gravel is very important. It needs to be a finer grain in size and it will also need to be fertilized to provide the nutrients to the plants.
I would suggest a layer of peat and Laterite under regular aquarium gravel or sand to provide the Fe needed by the plants. When using this method you must take care not to disturb this layer over time. If it is
disturbed and allowed to enter the water column you could create "nuisance algae" problems.
Whatever you decide on for a substrate keep in mind that the depth should be about 3 inches. A common practice to save on the cost is to layer your substrates.
By this I mean to set down 2 inches of an Iron enriched substrate (Flourite, Eco-complete, etc.) and then cap it off with either fine gravel or even sand.
I use sand in all my tanks through personal choice, in a small way I believe that there is a better nutrient uptake to the plants with sand mixed in due to root
contact with the substrate but I cant prove it. Sand mixed in also makes planting of smaller, delicate plants easier. Here is an article on using Sand and Flourite with photos for example.
Here is where the success or the failure of your planted tank can happen. The Aquarium Lighting supplied to you when you first purchase your tank is only intended for viewing your tank ,
the lighting is very much under powered to successfully grow a majority of plants in.
There is a formula called "Watts Per Gallon" that can get you close to the target amount of watts you will need to grow most plants but needs to be fine
tuned for some of the more demanding varieties of plants. Normally 2 1/2 - 3 watts per gallon will grow the majority of plants available that require "Moderate" light. Lets use an example tank...
If you take a common sized tank such as a 55 Gallon and only use the "supplied lighting" for that tank, normally 2 - 40 watt Flourescents, and do the math, 80 watts total divided by 55 gallons you will find
you are barely over 1 WPG... very little grows in 1 WPG other then Algae.
To get to 3 WPG in that tank you would need to at least double the amount of wattage input to get around the 3 WPG in that tank. If you used 40 watt NO Flourescents it would take 4 bulbs to get you to 160 watts which is more then sufficient.
Since available space over a tank is always a concern with lighting , you need to get more watts in the same space. There are a few ways to do this and the most common way is via "Compact Flourescent Lighting". They are available in many sizes and can be
used in combination with each other to get the amount of watts needed to grow your planted aquarium.
In the same scenario for the 55 Gallon, if you took and installed 3 - 55 W compacts over that tank instead of 4 - 40 watt NO's you would be at 165 watts total but your bulb intensity has gone from 40 watts to 55 watts with the pc's but you still achieved about the same in total WPG.
You will get better growth from the 55 watt intensity even though you are only 5 watts higher in WPG.
Another way to get more "intensity" from your Normal Output Flourescent bulbs is to do what we call "Overdrive" the bulbs through use of bigger ballasts. The idea is to use a ballast that is normally designed for either 2, 3 or 4 bulbs and apply it to one bulb giving the bulb much more intensity.
I have done this with great success but prefer the Power Compacts due to safety reasons.
Click Here for an in depth article on Overdriving.
Also, there has been much debate risen over the WPG rule in regards to some of the smaller sized tanks. You may find that you have hit the 3 WPG mathematically, but you are still lacking the "intensity" of the bulbs in question.
Example: Take a 10 gallon tank, by the math you could put 2 - 18 watt Normal Output Flourescent bulbs over it and have 3 + WPG "mathematically" but you still only have 18 watts of "intensity. You will not be able to grow many
varieties of plants successfully in this tank even though you are at the 3 WPG that we are looking for. Now if you take that same 10 gallon tank and put a 1 X 36 watt Compact flourescent over it you now have the same amount of watts
total but you have 36 watts of "Bulb Intensity" in which you can grow virtually any plants you choose.
The WPG Rule is very general and some thought needs to be put into lighting choices before setting up your tank, but always keep in mind that plants need the "Watt Intensity of the Bulb" to be successful, as well as WPG.
Nutritional Needs of Plants
Now that you have your tank setup with a good substrate and good lighting you need to supply your plants with a balanced diet of nutrients to begin growing a beautiful planted tank for your fish.
First of all, the stronger the lighting you have, the "hungrier" your plants will be. If they lack any specific nutrients you may find yellowing leaves, stunted growth, spindly stems, etc., all of which are signs of a nutrient
deficiency. The key is to find a good balance between lighting and nutrients to get the optimal growth from your plants without being overcome with algae. Algae will normally appear when we ignore an important piece of the nutrient plan.
When should I start fertilizing my tank?
It is common practice to allow the plants to get established in your tank for about 4 weeks or so before they show a need for fertilizers. This time could be longer in a lower lighted tank or sooner in a higher watt situation.
The only way to know when to start is by watching the plants health. Growth rate is normally slow in a new tank but plant health is easily determined.
What do they need?
These are available to us through our tap water and commercially sold liquid fertilizers such as Flourish, Kent , Tropica MasterGro , etc.
Start off by dosing per the bottle instructions. With time and plant growth you may find the need to up your dosages slightly. Excessive dosing will promote algae growth.
Macro Nutrients (Nitrogen, Phospherous, Potassium)
Nitratessupplied using potassium nitrate (KNO3) Target is 5 - 10 ppm
Phosphatessupplied using monopotassium sulfate or Fleet Enema Target is .5 - 1 ppm
Potassiumsupplied using potassium sulfate (K2SO4) or potassium chloride (No-Salt) Target is 20 ppm
Warning - Additional care must be taken when dosing macro nutrients .Over-dosing of macro's at best will only create algae, but at worst will kill your fish.
Be sure to have quality test kits on hand and dose the tank in small increments. The process of determining your fertilizing regimen takes weeks to set and it can change again with time.
Many plants (Swords,Crypts etc.) feed primarily through their root systems and need to be fed accordingly. There are fertilizers sold on the market in tablet form which get pushed into your substrate at the root base of the plant. Popular brands are Tetra Initial Sticks, Flourish Tabs, Root Tabs
Use these per package instruction and always bury them deep in substrate.
What about CO2?
The addition of CO2 is very important to achieve lush growth of your plants, especially when your tank lighting is anywhere above 2 1/2 WPG. In low light tanks where the demand is small for your plants CO2 addition is generally not needed,
but as you increase the strength of your lights, you are in turn increasing the demand for more carbon to get the most out of your plants. The target range for CO2 is usually anywhere from 20 - 30 ppm.
Im not going to go into a lot of depth about the How-To's of CO2 addition as there are numerous resources on the web allready describing in detail the set-ups to do this
There are basically 2 ways to add CO2 to your tank...
For 55 gallon tanks and larger this is the necessary route. It is more predictable and stable and can supply enough CO2 for your plants no matter how large the tank.
On smaller tanks, you can use a yeast and sugar mix to get the desired ppm's of CO2 dissolved into the water. It is much cheaper then pressurized systems to set-up and will provide you with plenty of CO2 for your tank. The down side's of a DIY set-up is the time , the mess, and more importantly the "inconsistency" of the ppm rate. \
However with patience, it is a very successful way to add CO2 and get lush growth.
These are just the basics of course to get you started on the right foot, but to sum it all up, if you provide a good substrate, some good lights and feed your plants you will find that it is not as hard as you thought to be successful.
So go ahead and give it a try, it will turn your aquarium into a piece of nature... ...and your fish will love you for it !
Article written by Buck.
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