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OK so after some very vigorous shaking, nitrates look like they might be at about 2ppm (not as yellow as zero, but not as orange as the next category at 5). I've done a big water change (maybe 30-40%) so hopefully that will help. I have been changing the water every week, but maybe I should be...

Thanks both for your replies. Unfortunately my Molly died this morning. I still have 2 and now 8 babies which all seem ok as are the cories and BNP.    I'm pretty sure the tank is cycled as I recorded a drop in ammonia from 4ppm to zero, then a spike in nitrite (that went off the scale). Then...

My sick Molly is still sick, but she hasn't died and everyone else seems fine. The temperature dropped to 24 deg overnight (one cold night) might that have cause some undue stress?   Also, I'm confused - why might readings of 0, 0, 0 suggest my tank didn't actually cycle properly? If the filter...

I did a fishless cycling adding ammonia to 4ppm every few days after initial levels dropped to zero. It took about 5 weeks for nitrite to drop to zero once the ammonia converting bacteria had kicked in, and then a further week for both ammonia and nitrite to come down to zero within 24 hours...

I have a new 125 litre tank, fully cycled and with stable ammonia (0), nitrite (0) and nitrate (0) levels, temp maintained at 26 deg C and a pH of 7.8. It has live plants, a bubbler, a terracotta pot, bogwood and sand substrate. I started with 4 dalmatian mollies and a bristlenose plec. All...

Hope someone can help/reassure. My new 125l tank is fully (fishless) cycled and ready for our first fish (readings of 0, 0, 0 after 24 hours at 4ppm ammonia) so after much umming and erring and many changes to our stocking plan, me and my wee boy ventured to the LFS and came home with 4...

This is my first ever fish tank and am after some advice on stocking and lighting.   I have a 125l tank set up with U4 fluval underwater filter (for up to 240l), a 200 watt Delta therm heater and two T5 Arcadia Tropical Pro 39W 850mm tubes. The substrate is part sand, part small gravel and a few...