I have upgraded to a larger tank which is 2nd hand, I have attached pictures if anyone knows about this unit, it’s an Interpet brand, it’s missing the filter/heater section which should be at the back of the unit, there are spouts inside which I assume flows the water, does anyone know what I need for this to work, I was just going to put my own filter in from my other tank a free standing one and heater, but if I can find the parts I need for this tank, I think it would look much better, the bulbs are already in it and all working fine, would really appreciate if anyone can help with this, thanks