GH: >10 - >16
Temp: 27 - 28 degres celsius
We noticed the use of fluorescent light for heating, mechanical filtration, minimal algae on the leaves, substrate used was gravel and the tank was dominantly populated by fish with very little vegetation which explains the high levels of nitrates because their are lass plants to absorb the nitrates with more fissh giving off waste products that break down into these nitrates.
GH: >7 - >10
Temp: 21 - 25 degrees celsius
We observed that tank B was not the cleanest of tanks, there was algae on all surfaces including the leaf surfaces of the plants in there. There were also a few snails and lily like floating plants, A mechanical and box filter with zeolites against the tank wall. Heat was supplied by a LED lighting system. There were quiet a few fish and vegetation which explains why nitrate levels were not that high.
pH: 6 - 7.2
Temp: 28 degrees celsius
In tank C the heat source was a Fluorescent light bulb, the substrate was a sandy one, there was algae growth, the tank appeared dark and crowded by vegetation, therer were lily like floating plant structures, there were snails, mechanical filtration was used and we sort of recognised two species of the plants: the amazon sword and the free floating elodea.
Out of all the tanks Tank B was the best according to water quality and Tank A was the worst.