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Discussion Starter · #1 ·
Well I had a big big tragedy and lost all of my fish that I have left. It was a very stupid mistake and i rather not talk about that, thats not the reason for this thread.. :(

the reason for this thread is that i just got pressurized co2, and i have ferts and high lighting and was about to make a plant purchase. the questions i have are:

are there any benefits to having a fishless planted tank?

can i input maximum co2?

should i leave the lights on longer?

should i overdose with excel?

now that there are no fish, these all seem like safe things to do but i could be way off. thats why i want to ask. are there any other benefits?
 

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yeah you can go nuts with co2 if you dont have fish.
you really shouldnt leave the lights on too long, you can still get algae
you dont really need excel with pressurized.
 

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Actually a fishless tank is somewhat inferior to a tank with fish. If you have 2 tanks side by side with similar plants and maintenance over time you will notice that the tank with fish actually has a little bit better looking plants. The difference is small but you can see it.

I can't attribute that to fertilizing from the fish waste only - N and P. But it could be a question of continuous slight fertilization from the fish waste.

Here's a fishless tank that I had years ago. You can see that the only fish was a single red pencilfish that you can see on one of the pictures. Note that the tank was severely overdosed with P. And look at the Java Fern too :)
http://www.aquatic-plants.org/gallery/javafern55

Another fishless tank. Only cherry shrimp. Never fertilized, never fed:
http://www.aquatic-plants.org/gallery/album29

More fishless;
http://www.aquatic-plants.org/gallery/first55

http://www.aquatic-plants.org/gallery/album26

http://www.aquatic-plants.org/gallery/desolate55

This could also be considered fishless - just a few fish in 240 gals:
http://www.aquatic-plants.org/gallery/exoticaquaticsLFS

--Nikolay
 

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Hey Niko, all the tanks you posted links to look good to great. What are you noticing in these links of fishless tanks? David

Actually a fishless tank is somewhat inferior to a tank with fish. If you have 2 tanks side by side with similar plants and maintenance over time you will notice that the tank with fish actually has a little bit better looking plants. The difference is small but you can see it.

I can't attribute that to fertilizing from the fish waste only - N and P. But it could be a question of continuous slight fertilization from the fish waste.

Here's a fishless tank that I had years ago. You can see that the only fish was a single red pencilfish that you can see on one of the pictures. Note that the tank was severely overdosed with P. And look at the Java Fern too :)
http://www.aquatic-plants.org/gallery/javafern55

Another fishless tank. Only cherry shrimp. Never fertilized, never fed:
http://www.aquatic-plants.org/gallery/album29

More fishless;
http://www.aquatic-plants.org/gallery/first55

http://www.aquatic-plants.org/gallery/album26

http://www.aquatic-plants.org/gallery/desolate55

This could also be considered fishless - just a few fish in 240 gals:
http://www.aquatic-plants.org/gallery/exoticaquaticsLFS

--Nikolay
 

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With no fish you can pump as much CO2 into the tank as you want. However, lights and fertilizing still has to be balanced just like a fish tank.
 

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The problem I have in my fishless tank is that there is a fluffy green algae that normally is eaten by the clean up crew. Of course, I have the CO2 too high for fish or shrimp, and only a small handful of snails survive in the tank. The plant health and coloration is the best I've ever seen due to super high CO2, super high light, and super high turnover rate.
 

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Discussion Starter · #8 ·
by turnover you mean filter? do you see more growth with high co2. and is the nova current extreme 78 watt light medium or high in a 30 gallon. 2.5 watts/gallon is high i would think. and how high is your co2?
 

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Turnover rate is how many gallons per hour of flow are in the tank versus the volume of the tank. In this case it is a 10 gallon powered with a pump rated for 295gph, which then has some loss of flow because of tubing and a spray bar. It ends up being probably around 200gph, so 20x the tanks volume an hour.

High CO2 doesn't necessarily mean faster growth, it means healthier growth. Growth rate is more about the amount of light over a tank, and the nutrient levels provided to the plants. The fun part about having a fishless/shrimpless tank is that you can go really high with the CO2, but as I was saying, too high and it is hard to even keep snails, and then you can run into issues with algaes that would normally be consumed.
 
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