Woke up this morning to find one of my red blonde male guppies has died He had been hiding for the last few days but always came out for a swim with his other guppy friend every now and then. I noticed that he has some red marks on his body and I'm not quite sure what they are... I am still in the process of cycling my tank (10G) and there are also 5 neons in the tank which seem great, no change in behaviour. I am aware they need larger than 10G but I am still looking to rehome them. Parameters: Ammonia 0.50ppm Nitrite 0ppm Nitrate 0ppm I have been doing daily water changes between 25-50%. Anyone have an idea what the red marks are or why he died in general?