Is the tank too big for them? Will they get lost? Will I have trouble finding them?
What filter is recommended? I know that the fx5 would be pretty ideal for a 150g, but my turtles are only a couple months old and less than 2 inches. Im thinking of the fluval 405? It would be a lot cheaper and fit under my stand.
What other preparation do I need? The water will be sitting in the tank for around 24 hours before I plan to put my turts in. Do I need to worry about ammonia levels, hardness, ph, etc etc? If so, how can I take care of this?
How powerful of a heater is recommended? I live in a condo where heat/AC is free, so I plan to have my room ~24C year round. I would only need to heat the tank about 2-3C more than room temperature, would some basking lights be able to do this?
Thanks in advance guys!
Pic of tank:

Pic of the cuties:




