I don't know how you manage to watch TV with a fish tank under it. I would be too distracted
Ok, what is RO, HMA, and pothos?
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RO and HMA are similar units used to remove impurities from water. They will remove all of the undesirable metals, fluoride, chlorine and a few other nasty bits. RO units will remove everything from the water, which can cause fluctuations in ph, and remove some other vital components of maintaining water chemistry. They are chiefly used in saltwater systems because you can add the needed components with various products which will give you a highly reliable chemistry. To my knowledge no such products exist for freshwater use, so HMA filters can be employed instead. They work in a similar way, just without risking freshwater chemistry, and is a much less wasteful product. RO units filter the impurities out and leaves you with a lot of water filled with the impurity you pulled out, and as such it is mostly discarded. HMA filters to the best of my knowledge create no waste water. Some people will use RO water on freshwater tanks and add a portion of unfiltered tap to keep the ph from being effected too heavily. HMA filters are generally used by fish keepers who keep very expensive and/or delicate fish. They are very popular in the discus seen because discus fit both those categories. For the average fish keeper they are unneeded, unless your tap water is quite volatile which means you wouldn't want to drink it for yourself either. Others can chime in here because I personally do not run HMA or RO units, and the information is off the top of my head, and as such somewhat unreliable.
Pothos are terrestrial plants that grow well in lower light situations. Due to their low demands they are often used in house plants, on a windowsill or in an area with a decent amount of light. For the sake of aquarium use the lowlight requirements allows you to use them as a tool to consume nitrates without requiring a lighting unit for the plant itself. It is called devil's ivy and golden pothos among other names, and because it is terrestrial the leaves cannot be submerged so you can only submerge the roots. Pothos is a powerful tool to maintain desirable water conditions, and is relatively cheap and easy to employ. The only difficult part is that because they cannot be completely submerged you are left with the plant sticking out, which can be a deal breaker in a show tank system. You can read into it more in this thread that is stickied in the DIY filter section, it is more informative than the what I was able to provide. http://www.monsterfishkeepers.com/f...-plants-less-nitrate!-POTHOS&highlight=Pothos