Hi all, bought my son a 54L aquarium back in feb. for his birthday and got hooked on the hobby straight away. We have a cycled tank with 13 fish, 4 x Zebra Danio( unfortunately we lost one), 5 x glowlight tetra, 3 x Harlequin Rasboras & 1 x Guppy. Having a problem with high nitrates at the moment, tap water is 40ppm tested using the ipa nitrate test.I am using prime to condition the water,Tank seems somewhere between 50/80ppm so im contemplating using 50/50 bottled & tap water to lower this reading, i have 5 live plants & all fish seem happy.will be adding 2 more harlequins in the next week or so if nitrates come down a bit, any advice would be welcome thankyou.