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I have a 20 litre tank with filter and heater. I have a mixture of mollies and guppies. I think one of my mollies is pregnant. She's been getting bigger for the last 2 weeks but I can't see a gravid spot.
Hi,
How many fish do you have and how long have they been in there?
Is there a filter?
Do you have a liquid test kit? and what are the parameters?
Ammonia
NitrIte
Nitrate
pH
Temp
TDS
GH/KH
How long has the tank been set up? Are you familiar with the nitrification cycle?
Here is a really useful article which will give the basics about the nitrification cycle and some useful and lifesaving information about keeping fish in general. As well as a couple links for fish-in cycling directions.