Disturbed Fish?

[fish nutter]

hi everyone,

My 10 rummynose tetras are constantly at the bottom and at the front of the glass when i have my lights turned on. Every time i turn off the lghts they swim to the top and go to the middle of the tank and along the glass. is this somthing i should be worrying about?

My tank is a 250 liter / 50 gal tank, and has a double tube light hood with reflector, it is a T8, one bulb is a Tri-power 15,000 K light and looks purple (came with the light hood), and a other one is a new power-glo 18,000 K that looks white.

Any help is appreciated, thanks

 

[OldMan47]

Both of those light tubes are outside of the normal requirements for your fish. In a freshwater tank, the lamps have a light spectrum of between 5500K and 10000K. Your lamps, with a much higher energy light spectrum, have the disadvantage of being too good for algae growth without the benefit of being good for plant growth. Where does that leave you? The answer is simple really. You need to get some fluorescent tubes that have a longer wavelength, lower spectrum number. You want to replace your lighting with tubes in the 5500K to 6000K range. Those tubes will provide lots of light in the range that can be used by plants without providing as much light energy outside the range that your plants can use. This is not very exciting information but is the straight scoop.

 

[fish nutter]

Both of those light tubes are outside of the normal requirements for your fish. In a freshwater tank, the lamps have a light spectrum of between 5500K and 10000K. Your lamps, with a much higher energy light spectrum, have the disadvantage of being too good for algae growth without the benefit of being good for plant growth. Where does that leave you? The answer is simple really. You need to get some fluorescent tubes that have a longer wavelength, lower spectrum number. You want to replace your lighting with tubes in the 5500K to 6000K range. Those tubes will provide lots of light in the range that can be used by plants without providing as much light energy outside the range that your plants can use. This is not very exciting information but is the straight scoop.

ok, thanks. I just rang up my LFS and they do sell them, however the person thinks that my plants will not grow as effectively and will just die off after a few months.

Thoughts? thanks

 

[fish nutter]

will fluorescent tubes run on a T8 light hood?
Thanks

 

[fish nutter]

My 10 rummynose tetras are constantly at the bottom and at the front of the glass when i have my lights turned on. Every time i turn off the lghts they swim to the top and go to the middle of the tank and along the glass.

Is this unusual and something i should be worrying about?

cheers

 

[fish nutter]

sorry double up