Although there are always slight fluctuations, by now herbivores tend to have clearly defined niches and predators clearly-defined single prey. Several turns probably occur with nothing much happening. There may be a great deal of defensive DNA buying, such as purchase of P DNA to expand an ecotype's lead in this category. With the Cenozoic Era looming, ecotypes often retreat from their size 5-6 positions, causing changes and disruption in the previous stability. Predators specializing in Size come under pressure.
Bidding becomes more desperate as players seek ways to edge out the competition.
Herbivores are looking for roadrunner DNA which the predators try to keep from them while the predators seek ways to oust predatory Immigrants. This plight is made worse by the fact that unlike mmm who is in the same situation, rrrr cannot act as an omnivore and rrrr must always go first. Although marine biomes have difficult requirements, this can be a benefit instead if considered properly as generally only those really trying to live in the sea will succeed there. Few will, so this should leave the sea clear for you. First of all, rrrr should plan to go marine from the outset.