You need to establish the parameter of the style of tank you want:
and start with the most important one, get it right and pass to the next:
Example Amazonian Tank :
TempΊ 76Ί / 78Ί
> get a good heater, the most precise you can afford and a good thermometer (some cheap one have big difference with reality)
Filtration 3 ΰ 5x volume / hour
> Get a good filtration ex: wet/dry canister + 1 hang-on + 1 power-head, keep in mind the nitrification cycle (transformation of ammonia in nitrate by bacteries).
and keep in mind the Prandlt boundary (zone around a water plant that have to be penetrate by nutrient, thinner and easier if a good water movement. Dont disturb to much the surface because you will loose CO2 (15 to 30ppm), you can use aeration at night when plants release CO2. keep attention at your filter media ex: use of peat for acidifyng water and avoid charcoal that will suck up nutrient.
good lighthing : 2 to 4 time the volume in watt ex: 33 gal= 66 watt to 120 watt with good spectrum > mix of daylight and plant spectrum neons, 10 to 12 hours on a timer.
Injection of CO2 with yeast or pressurized (with pressurized you can use a solenoid valve on timer to shutt off at night
Use a good size sand (non reactive, that dont leach any substance) that you can spike with fertilizer stick or Laterite or a mix to have some nutrient in the sand.
Keep the water inside the good parameter (Good test kits)
PH 6.5 / 7
KH 30 / 50 ppm)
GH 40 / 120 ppm
CO2 15 ppm to 30 ppm
Mg 5 / 10 >45 ppm
NO3 5 / 10 ppm
P04 0.2 / 0.5 ppm
K 20 / 30 >50 ppm
Fe 0.1 ppm
Change your water something like 10 to 20% every week or two> fabricate a water close to your water parameter. Replace the water that evaporate with RO (reverse osmosis) or some kind of demineralized or distill water.
Keep the sort of plant that comply with your parameter in a good quantity. Mix of slow and fast growing plant.
Dont forget a good ratio of fishies.
I probably forget something...