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Picture attached - I hope

My water's hard - can I use a water filter (for human use) to reduce water hardness?

Test kit just came. Before water change: Cl2=0 PH=7.6 KH=7.2*d GH=16*d NO2=1 NO3=50 After water change Cl2=0 PH=7.2 KH=10*d GH=16*d NO2=1 NO3=25-50

The freaked out tetras suddenly happy and re school ed after I moved all deccies to back (more hiding places) and thus more swimming space. The guppy stopped picking on the tetras as a result. I guess, apart from ammonia, I'll have an issue of fish wanting to establish territory in a small...

HI, I cycled the tank at start-up, part ammonia source and part source with no fish in. Since adding fish I have been completing partial water changes daily - between 25-40%. I've also started vacuuming the crap out of the gravel. Gave up on non-chem intervention and bought API Stress Coat...

Can you explain why too many fish please? What is the net effect? Not enough swimming space? Or too much waste? All fish currently very vibrant in colour this morning. Even the danios white stripes are iridescent. The red on the neon's were just at their tail when we got them, but now deep and...

I was considering secondary filtration. I have seen advice about plants taking the nitrates. I need to act fast though. I forgot to tell hubby we weren't feeding until secondary biomass cycle was complete, and he fed them last night. Within a few hours the danio that had mild colour loss...

Small internal filter. Didn't use any chemicals to cycle. New territory for me. Used to own a huge tank with external filter. The filter was bigger than my current tank. Used to use chems for the big tank. Trying to do it 'au natural' this time. No chems. The fish look brighter and healthier now...

I've seen some general guidelines about number of inches of fish per litre. Yes, only visual so far. Can't wait for test kit. Wondering why a shop can have so many fish in one tank when we barely have any and then be told we're over stocked.

I have a 5 gallon tank (I know not recommended, but largest we can accommodate in our home). We cycled it for a week - watched water go cloudy and then go crystal clear. Added 5 zebra danios, 6 guppies, 6 neon tetras and 1 bristlenose catfish. After 2 days I noticed one danio had slight colour...