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Clear outdoor tank

Hi folks!

Just want to share this experience with all of you here.  The water in my 20 gallons outdoor tank has always been green and i cannot see a single thing in it.  But that problem is over after i put in 2 small bunches of emerged Ceratopteris.  Within 3 weeks, the water is clear.  I'm not using those ceratopteris to shield off the sunlight but to absorb the nutrients in the water column.  The plants i got is bout 1.5 feet high so part of the plants are emerged and only stay in 2 little corners of the tank.  A few bunches of vals stop growing after the water became too green for the light to reach them but they resume their growth right now.  

The tank does not have any filtration, aeration or additional CO2.  Only sunlight and a dozen of fishes.  I would suggest to you guys out there to use that to clear the pea soup in the tank.  I reckon emerged ceratopteris will do a better job at that as the emerged one grows much faster then the submerged and can get the CO2 from the atmosphere.  If you put in more ceratopteris I reckon the job could be speed up much faster.  

in sunny and rainy KL, Malaysia

ps:  I did not plant the ceratopteris in the gravel.  Just use some big stones to weight it down in a plastic pot.

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