I've come back to the hobby after a long time and decided to start up with a nano tank to see if I still enjoyed it, with the plan to upgrade to a bigger tank and keep the nano as a breeder. All was going well with a bristlenose pleco and 4 neon tetras, nice minI LED set up, couple of plants, filter going well. Unfortunately the filter died completely with little warning sometime overnight on a Saturday/Sunday and no shops near me open, I started doing daily 50% water changes as plecs are messy bugger and the tank is really small. Plec didn't like this and by Monday midday had sadly died. Devastated as it was the friendliest plec I have ever had - I think the low light LED set up was perfect for him. Emergency chat with my dad who has been a long time fish keeper, freshwater and pond (although not for the last 10 years or so) and we decided to just go all out and get the big tank, new filter, move the bogwood, plants and filter medium over and then hope the tetras do ok with the change. Return late afternoon Monday from lfs with a 65L tank, new filter (fluval U1 sponge filter) a bigger heater, an air pump to attempt to reaerate the minI tank and eventually be used in the big one. Down one tetra on checking them, so immediate 25% water change as not looking so good, and set the airstone going to add O2. Set up new tank - moved bogwood, and java fern over, filled with spare sand (need another couple of bags though) and filled up but by the time it was up and running with filter spray bar adjusted and temperature in the right area the other tetras had died. Absolutely devastating. Feel so bad that I didn't have a spare filter and the whole thing just feels like a massive failure on behalf of the lovely fish. I don't think they coped well with the moveing of wood and plants and the water changes. So, having got this new tank partly set up, I will unfortunately be starting rather from scratch. My dad has decided to get involved again as he retires soon and wants to start up breeding various green mollies together to make his favourite fish. So he'll be using the nano tank as a breeder (once cleaned out etc, and new nano filter sorted). I'll be using the main 65L tank, but having lost all of my filter medium I'm a little at a loss - everything is much changed from when I had tanks before! The bogwood and a java fern were transplanted so hopefully still have a lot of lovely bac on them that will help the filter, and I'll be shifting the sand and the anubias into it once the nano has been cleaned out. Do you think this will be enough to kickstart the filter/cycle going? We've always been as chemical free with fishkeeping as possible, so would rather not use a "jump start" liquid. The tank won't be hugely stocked - just some neon tetras, a bristlenose pleco (maybe two now there is more space!) some mollies and maybe a couple of colourful male guppies. So the fluval U1 filter should suffice, if not I'll grab a minI and add it in as a secondary filter. It will be a planted tank and I need to get on and purchase some more plants, prefearbly low maintenance and not requiring CO2/carbon additions as I'm planning on switching out the horrible fluro light for an LED strip set. So any thoughts on those would be great. Is there anything I have forgotten or might pose a problem in this setup? Water temp is going to be at around 24C and I'm not 100% sure on our pH but it's not been a problem with those fish before. Just devastating to have failed looking after the little lives. Nano tanks are lovely, but when the filter goes, they are just so hard to save without backup equipment Thoughts on everything mentioned appreciated, and apologies for the essay!