IDK if I am in the right thread section but I need help. I recently came across some fish equipment in my attic I was wondering.
1. What are they
2. how do they work
3. R they good for a 40g?
4. What are they worth
Any help is greatly appreciated.
These I believe are a kinda filter?






I know this is a heater

Help :help:

1. What are they
2. how do they work
3. R they good for a 40g?
4. What are they worth
Any help is greatly appreciated.

These I believe are a kinda filter?






I know this is a heater

Help :help:
