Ahhh yes..... 'Oscar6' is indeed a well-versed spokesperson for those New World aspects of the aquarium hobby! 8)
So well, though I'd absolutely love to help you set up some thing more quiet, green and actually kind of peaceful.... I'll give you some freshwater basics you can consider and possibly use.
To begin, one of the biggest advantages and draws of the freshwater aquarium is - freshwater! The simplicity of maintaining fresh water chemistry is hugely compelling. So, with that in mind as a so-called 'core principal' you will need to see just what sort of tap water you have. I suspect you have a city/municipal source - but sometimes well water comes up as a pleasant surprise.
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- WATER: Think of this as a relationship. So, you will probably have the best long-term relationship with your source of freshwater, if you like what it is naturally and are able to use it 'as is'. Fighting that water to constantly modify it to fit your own needs, kind of kills the buzz I guess. So, test your tap water and see what's going on with it. If you have been provided with a relatively hard/alkaline source of tap water? You may not have to do ANYTHING with it when adding it to your tank, beyond adjusting the temperature a bit and adding dechloramine treatment to make it safe for your fish (Mbuna).
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- BOG WOOD: In the relatively small confines of the African Rift Lake aquarium (even one as big as yours), the natural properties of the bog wood will affect the water chemistry of the aquarium. When submerged in your aquarium, natural bog wood will slowly leach acidic tannins into the water - counteracting the higher PH you need for the African Rift Lake eco-system. But, if the look and natural feel of bog wood will be important for this aquarium because of aesthetic reasons? You may be able to find artificial pieces that will have the look and feel of the real thing. Modern, resin cast pieces can look very authentic, and will be totally, chemically inert when placed in the water of your aquarium.
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- PLANTS: The hard water and higher PH conditions of the African Rift lake are actually not much a problem for a great many aquatic plants. When introduced to that water, a lot of plants may sulk a bit initially, and some might even die. But by and large most will ultimately adapt to the hard water/high PH conditions and grow strongly in the aquarium when light and proper sources of nutrition are provided for their needs. So, if its not the water....? The problem with keeping ANY live plants in an Mbuna based aquarium is gonna be those cichlids. In Lake Malawi, Mbuna cichlids spend their lives grazing on thick sheets of algae growing on these massive, submerged rocks. Oh yes, and with long intestinal tracts adapted to eat that algae - they do love their veggies - and will just absolutely DESTROY just about any live plants placed in the tank with them.
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- SAND SUBSTRATE: 'DJRansome' nailed that one. And yes, I know just how tempting it seems to provide a black sand bottom for an aquarium. Beyond the difficulty of sourcing that type of sand and much higher expense - it inevitably comes out over time looking washed and and kind of dusky in appearance. It's just going to happen as bio-slime, diatoms and other things will work their way into and coat the sand. This is actually a good thing - but will inevitably, visibly detract from the deep black appearance desired of a dark, bottom substrate. My recommendation? Go with coarse particle sized, pool filtration sand. Your cichilds will love sifting and digging through it, and It looks very natural. And when mixed with natural colored, small diameter gravel, will look almost identical in appearance to the sand bottom substrate of the rivers, lakes and other areas that the fish were initially sourced from.
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Good luck with it. And, it looks like this one is gonna be a real beauty when set up and running. Send pics! :thumb: