welcome to the forum!
first thing first, you probably just made a mistake but we have diffrent places for diffrent topic so this jumble of amazing info is hopefull, almost sane, and organized!
which it is pretty good with
i would vote for low tech. now with what im about to say is highly unheard of but works for me and hopefully for you too,..... if you decided to do a moss tank, with maybe a bit of other plants, invest in decent to high lighting. start slow with low light but over the course of the first year up the lighting slowly untill you are mid-high light, mosses seam to use VERY LITTLE nutrients and love high light, seachem exell or CO2 doesnt hurt either. if you need moss, let me know I'm begining to have quite the collection.....
now I'm going to confuse most people probably, dont bother with water changes for the most part. exceptions would be the begining when the tank is first set up, maybe. I read a post by tom barr which described why we get algea blooms a lot in low light tanks and it usually has to do with unstable nutrients, so if you take out half your tank's water which is mediumly loaded with stuff, and add say 60 more gallons of fresh tap water, there is a HUGE nutrient and CO2 swing which will usually trigger algea. so in your case just do top offs mainly.
also with this stock pretty lightly, some school of small fish to help with poop= nutrients from fish food and other stuff. also some nice algea eaters, in a 120g i would recomend around 10-20 otto algea eaters, and a pair of bushy nose plecos or a pair of albino bushy nose's or just a larger group of BNP or ottos. also shrimp, cherries are great!
my tanks are like this, i havent sat down and written down how ive really done it because im still figuring out how i work it
. but it works some crazy way.
now im not an expert by any means, been in the hobby a year and a 4 months now, and am 14
but hell, age is just a number. i spend a lot of time reading posts here and around the web. i believe i have somewhat of a knowledge base but i wouldnt just use what i say, im still a newby.
if you want more info on my crazy ways just let me know, i will try and explain my madness.....
- Fish Newb