the built in one that i had was poor in my opinion so instead i got a fluval internal one (not sure on the exact model) and i think that is good but i still think an external one will be better as it will not be sitting in the tank clogged up with the dirt so that should be better for the tank.
Im going to go for the ehiem 2217 as my girlfriend has said she will buy it for my birthday so thats good lol.
And thanks for the info minnnt, i will be popping to the fish shop over next couple of weeks as i want to leave the fish to breed before i change the tank around.
As for the breeding this is 3rd time lucky, first time they killed all the fry within a week, secound time i caught around 50 fry and placed them in a net and left around 20 in the tank and the male ate them all including the ones in a net as he managed to suck them through the smallest holes possible, What would people recommend for fry so that i am able to keep them (I havent got the room to buy a smaller tank for them as i have to many reptile tanks in my room)
Cheers