Now I have got a question, I researched a bit but have not found final answers and come to ask you...
I know it may sound stupid, but i can't have a Sump (no space)... and i was wondering about the possibilities...
can i combine a skimmer with an external filter?
The idea would be to connect the external filter´s "IN" hose to the "IN" Skimmer, draining the aquarium water to the skimmer that will execute the process (theoretically normal) draining the water to the external filter and this one will send it back the the aquarium ...
Something like this:

More Q:
1.- will this work correctly?
2.- Do i really need a skimmer if the population is: 2 gap (in 40g temporally) and dense carpet of Caulepra prolifera?
