excellent read!!! Thanks a lot! Cleared tons up there.
I did actually notice that they continued to grow once floating....
What I do wonder is if I should be using any plant nutrition/fertilising substances. I see tons of them online but has never really considered if I need to invest.
Also, it seems the only place to get decent plants (not anacharis and other beginner plan
Thanks! It means a lot when someone actually appreciates the time spent in posts.
So would argue that Anacharis grows in any condition, which explains why they're often grown in tiny cups on windows and in cold ponds!
Another argument would be that in fact, this "pond weed" grows much better in an aquarium when floating. Why? Well, plants requirements to grow are pretty basic (water, light, nutrients etc.), and although all plants need different proportions of these, same rules often apply when you increase only one of the requirements.
Let me explain this further...(This is where it gets confusing.)
Your aquarium has a "bank" of nutrients, light and CO2 in it's water column. Your anacharis uses as much of this as possible. However, It keeps the ratios all the same for each. Thereby meaning, if you doubled the strength of the light the plant got, but didn't up the CO2, the plant would not grow any faster as it'd still be maxed out on the CO2.
In order for a plant to grow as fast as possible, you must increase ALL of its nutrients accordingly. As explained above, only increasing the light, for example, and not anything else, will not help the plant to grow but instead increase the amount of light in your aquarium's "bank.". When there is light to "spare", this provides the best environment for algae. But that's another topic.
And so - this brings me back to the argument of whether or not a floating anacharis grows better than one which is planted.
A plant which is floating, understandably gets the strongest light (light strength weakens the deeper it gets in water.) Meaning, it can use this extra resource to its advantage. However. As I've tried explain above, in order for this plant to utilise the extra light, it must be provided with more of its other requirements.
So in short the answer for this argument is: "It depends."
So moving on to your next question (which nicely flows from the previous.)
"Should you add nutrients?"
Educated Answer: Well, it depends on your circumstances. Adding any nutrients won't be of any use, unless you increase the light and CO2. That is of course, if you don't have nutrients to spare already. If you find that adding nutrients doesn't help, then maybe nutrition isn't the issue. It could be the strength of your light, or the amount of CO2 in the water. With plants, it is all a guessing game.
Answer for you: By the looks of the picture you have supplied, my initial guess would be that "Yes - adding nutrients would help. Especially root fertilisers (often known as roots tabs)" My reasoning behind this is that Amazon Swords are dedicated root suckers (not an expert term. I just made it up.
) This means that they get 90% of the nutrients through their roots rather than through the water column and their leaves.
As your tank is gravel, this means that it holds no nutritional value at all. And effectively, the only nutrition the plant is getting is by the water getting under the gravel.
Nevertheless, adding any sort of fertilisers generally help. If you notice sudden algae, stop using it. This shows there is a surplus of nutrition now and the algae can grow. For now keep to liquid fertilizers or root tabs. Changing your substance to something other than sand could have no point.
Also - I'd have no fear with buying aquatic plants online! So long as they from the UK and have a guarantee of being alive when delivered, then all is ok! Check their estimated delivery date, Anything over 4 days is pushing it. Just remember that these ARE plants, and as much as we love and nurture them, they still just are plants and many land plants survive dieing every winter... so just bare that in mind
My posts keep getting longer
Keep the questions coming and I'll try and answer them as briefly as I can!