Well, I have just had my tank for a week now... all my fishes seem pretty healthy... swimming around quite actively... so shouldn't be any problems... I do regular water changes... about 10% every 2 days... coz my filter is a bit small... it is a Rio 400 pumping 420 litres/hour... and my tank is a 4' x 1.5' x 1.5' which is about 200 litres...so the pump is turning over the water in the tank 2 times an hour... I know this is a bit low... and I really need an external canister pump... but I can't afford one now... will get one in the next few months when the fish get bigger... and i figure with regular water changes...it should be allright?
my silver is about 6-7 inches now... pleco is about 7... clown loaches about 2-3, silver sharks about 3, and I have some plants in the tank... pebbles.... some big rocks... some driftwood