I have a trio of turquoise rainbow (Melanotaenia Lacustris) that I set up in 29G for breeding with 2 mops and about 10 dwarf water lettuce with roots that go down to 1/3 of the tank depth. Yesterday, i saw a few eggs on the bottom, a few on the 2 mops. Then as I looked around more, I saw about 25-30 eggs on the Dwarf lettuce roots. I was amazed they were all the way up to 1/2 inch from the surface. It seems they preferred the plants roots to the mops that run the all depth of the tank. Will have to set up a 5g for growing the frys once they hatch. Next group will be a trio of Melanotaenia boesemani.