So I have a lizard cage and well one of my lizards just died the other one is alright and such but my real question is this : If i give my remaining lizard to my neigbor but keep the tank will i be able to buy a filter and such and turn it into a freshwater fish tank? The lizard tank looks like a 20 gallon and since i was never good at keeping reptiles i really dont want to kill this one, so i was thinking it would benifit me more if i tuned it into a fish tank. You know just thinking out side my multicolored box of fun.