I'm not sure why you would change the rocks (and I assume you mean gravel?) but you should vaccuum the gravel (with a special gravel washer) once a week.
Plants and rocks. Fishes usually give birth in the shallow waters.
rocks and waves increases it there might be fishes and crabs(.....ect......)
yes rocks will change with vinager
Once a week.
yes, rocks change. metamorphic, sedimantary and igneous rocks can change into eachother.
In my opinion for the fishes feel more in their real habitat and look good in a aquarium!
Ignitous rocks
Igneous rocks change to Metamorphic rocks through heat and pressure. Igneous rocks change to sedimentary rocks through weathering and erosion until the igneous rock is sediments. The sediments then compact to form sedimentary rocks.
they change into metamorphic rocks
no
Rocks change water level bye ............................the weight of the rocks makes the water highterr ?
A fishes behavior would change in a few ways if it had an open circulatory system. However, the most common would be the fish would become extremely active.