hi thanks for your help so far i think i will go for the lidded tank rather than open next qu. should i go for the tank with the built in trickle filter 3 or 4 types of media in back of lid type (it runs along the length of the tank) or go for the external filter . i already have a fluvel 302 big one which i can also run if necss. are trickle filters ok or should i go for the extern. 
