Hi so my tank is cycled I've had it nearly three years. Its 170 litres which I upgraded recently. My ammonia is 0 my nitrite is 0 pH 8 kh and gh are are good, now in my old tank my nitrate was at about 20....i tested yesterday and it was more very very dark orange maybe reddish... So obviously higher maybe 40-80 so its higher I'm going to guess its from over feeding... I've not added any fish, or anything so that's not caused the increase. So I'm gonna cut back food, but I know other things can help keep nitrates low like plants but how many plants would I need? I don't want a heavily planted tank as goldfish just destroy them haha. Would moss balls work? It's not neglect either, I always do at least one water change a week sometimes two! Can nitrates cause flashing? I've wrote about on going flashing that I've treated for flukes and parasites and it hasn't made a difference so could the rise in nitrate csuse it? Thanks!