If your fish have not grown past 2" in 5 months than it is more likely a diet issue. You have them in a 120 gallon aquarium with what looks like plenty of filtration so that does not appear to be any issue.
Water changes help with growth I believe. You need to be performing weekly 30-50% or Bi-weekly 50-75% water changes.
Feed twice a day a high quality pellet food, or spirulina based flake food.
Personally, I would feed New Life Spectrum Cichlid Formula - 1mm pellet, or Hikari Excel - Mini Pellet, or Dainichi Veggie FX or Deluxe - Baby Pellet twice a day. Make sure that if your switching to one of these foods, be sure to blend it in over a two week period with whatever food you are feeding now.
If you are already feeding one of these foods, then start feeding a larger quantity, but not more than they can consume in less than 2 minutes. You might even consider adding a higher protein food such as New Life Spectrum Growth Formula, or a higher protein Spirulina Based Flake food.
The higher protein will also help with growth rate.
The published growth rate of Tropheus is 1 cm per month. If they have not grown in the 5 months you've kept them there is a issue.
If you are already doing all this, and the fish are still not growing, I would go back to the Vendor and find out where the fish came from, and start talking to them.
Hope this helps..
Geoff
Water changes help with growth I believe. You need to be performing weekly 30-50% or Bi-weekly 50-75% water changes.
Feed twice a day a high quality pellet food, or spirulina based flake food.
Personally, I would feed New Life Spectrum Cichlid Formula - 1mm pellet, or Hikari Excel - Mini Pellet, or Dainichi Veggie FX or Deluxe - Baby Pellet twice a day. Make sure that if your switching to one of these foods, be sure to blend it in over a two week period with whatever food you are feeding now.
If you are already feeding one of these foods, then start feeding a larger quantity, but not more than they can consume in less than 2 minutes. You might even consider adding a higher protein food such as New Life Spectrum Growth Formula, or a higher protein Spirulina Based Flake food.
The higher protein will also help with growth rate.
The published growth rate of Tropheus is 1 cm per month. If they have not grown in the 5 months you've kept them there is a issue.
If you are already doing all this, and the fish are still not growing, I would go back to the Vendor and find out where the fish came from, and start talking to them.
Hope this helps..
Geoff