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Ive put down a 1.5cm layer of tropica and im capping it with argos play sand how deep should i put it? Now when I used a substrate calculator it said i need 40kg well ive put in 30 and it looks loads its about 4 - 5 cm up front and abit deeper at the back. Is this to deep?

When i finely set up my tank I want to use a layer of something like the tropica substrate caped with a fine realy wite sand. My question is what the best stuff to use that isnt going to break the ban? I quite like the caribsea wite moon sand but its so expensive. Some say play sand but some say...