Hi All, just wanted some advice... I recently noticed that one of my orange & black guppy is really big & has stopped eating & is hiding towards the bottom of my tank! Could it be pregnant? The other evening I saw what looked liked a thin clear like string coming from underneath it?? What is this?? I have a 38 litre tank, 5 Guppy's, 5 Neons, 5 Cardinals & a Pleco... Can somebody give any info please?? Thanks all!!