Hello, I just put a baby red eared slider (just over an inch long) into a bigger tank and added a heat lamp (just a 60w bulb) and a UVB light. Thing is I don't have an underwater heater and so should I leave the heat lamp on during the night? It's not too cold indoors here now, around 75'F. My parents also keep insisting I'm already doing too much and all (she believes all it needs is a pump and water changes...). Anyway, is an underwater heater absolutely necessary, or can I just leave the lamp on the entire day?
Also, with roughly 3 gallons of water in the tank, how often should I change the water without a filter? I was thinking half the tank each week. I know a filter is the best option but I'm terribly short on cash and my parents would just sigh at me for buying one.
The turtle has previously been kept in a smaller tank with room temperature water for over a year, with no lamp or anything.
Thanks for any help.






