Hi,

Since I do not know what type of pleco you have, I will provide a few generalities:

1. Many Plecos are strong in body with a good sized tail. That alone could cause issues esp with carpet or delicate plants.

2. Many plecos need wood in their diet, so please ensure you have some wood in the tank.

3. Many plecos need PLANTS in their diet, so some plants will be eaten. Many have observed (me for instance) that any sword leaves will be scaped clean and ruined.

4. Many plecos need algae to survive, so some must be provided, or a supplement.

5. They can be fed algae wafers and the like as a supplement, but no guarantee they won't eat your plants.

6. Plecos can get BIG based on the species. A 50 gallon tank is not really that big.

So, please provide the species of plecostomus and then research from that point on.

Hope this helps.