Free your Fish!

I am very much a collector or hoarder by nature, sentimental in the extreme, and I therefore find my tanks filled to capacity at all times, mainly with the gorgeous Mermaids one can breed at Level 15 and higher.  I do see, however, that if you wish to increase your Levels, selling fish is the way to go.  You do not earn the XP by breeding them but by SELLING them. 

Important Point about Gifts

Gifts are important in Fish Adventure Seasons, but if you allow plants to be placed or to fall in front of your Gift Box, you will not be able to receive ANY Gifts at all.    This partly is the fault of the game itself.  Whenever you open a gift, if it is a plant, it will fall into the tank in a random position.  Often, it will fall in front of your Gift Box.  After opening your Gifts, always make certain that the Gift Box is clear of any obstructions.  Plants are nice, but they can be an impediment where gifts are concerned.