I'd be very grateful for advice on stocking for my new tank. I have previously kept tropical fish but am getting back in after a few years' break, and want to do it right. The tank was given to me second-hand and is a Biorb Life 45 (I know, work of the devil, but I just have no room for a bigger tank at the moment). It is 45 litres and a tallish rectangular shape, dimensions width 38cm x depth 26cm x height 45cm. There is a heater. I have completed a fishless cycle (at ammonia 0, nitrites 0 and nitrates 5 currently on the API testing kit) and there are currently 2 male guppies in there who seem to be doing very well so far. I hope to add more fish once they have been in there a month. Ideally I would like to eventually work up to a total of 4 male guppies and 6 neon tetras. Is this going to be overstocked? I am getting wildly different results from websites such as AqAdvisor, ThinkFish etc. If this isn't a good idea, advice on different combinations would be welcome. Thanks in advance! Susie.