This will be my first aquarium and i will be going tropical. I have a Juwel vision 180l, bought second hand, comes with a heater and wavemaker, nothing else. The previous owner kept saltwater fish, so i have cleaned everything up with vinegar and plenty of clean water. I will be using play sand on the base and will also have live plants. I have no fish at the moment and won't until the tank has cycled. I'm waiting for my filter to turn up, fluval 206 external filter and a few other bits and pieces. I have a load of ironstone in the garden, can this be used?.