06-17-2010, 11:50 AM
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Welcome to Tropical Fish Keeping forum.
I agree with kymmie and johnny. Lights on over fish for 24 hours is highly stressful. The fish will almost certainly come down with something, frequently ich or worse. Fish need darkness just like we do, a minimum of 10 hours of total darkness.
A timer is a small investment in money but a very good idea for fish as well as plants. Fish are accustomed to a regular period of 10 hours daylight, 10 hours darkness and 4 hours for dusk/dawn each and every day in the tropics. Their systems are geared to this.
If you ever look into your aquarium in total darkness, say 3+ hours after the lights on the tank and in the room are out, and use a small flashlight, you will see many of the fish "sleeping." They lose their colouration, they respirate very slowly, they are inactive, some even resting on their sides. This rest period is vital, and when the light remains on they cannot manage it. Some fish are nocturnal and will be active in darkness, like many catfish; but these also rest during daylight under wood, rock and plants to balance their systems.