But they are already the biggest fish in my tank, so there is no big ones lurking around.

In other words, the water should be more acidic. Just to confirm. What is the ideal PH level.

I am now keeping two leapord plecos in my tank. I observed that when PH is high they change to a darker sharper colour, but when PH is low they turn lighter. What is the ideal PH for them? Any advice?

Thank you for your advices. I have gone to cat-elog to look at what they look like and I think they are locally available. I will fetch them tomorrow to see if they are better workers here in China.

I keep mostly tetras in my tank, the temperature I have set is 26 degree celcius, the tank size is 62 liter tank. Does that make a difference to pleco's eating habit? I would appreciate if you can post a photo of the type of pleco you refer to. Thank's to both of you.

Whether you have to get a licence or not depends very much on the country you are travelling to. For some endanger species, you do have to acquire a licence to even keep them. Safest way to check with Custom and Excise. I work in China, which is famous for its gold fish, and in the wholesale market ...

I am new to this forum, but as a fish keeper, I think Pleco's are very important to the health being of a tank. I am now in search to buy Plecos that are good algae eater, since I found some of them are not so active. Can any one suggest a few ideas?