Thinking of getting a single Indian pea puffer in my 20L tank, now inhabited by a pair of apistogramma and 2 guppies. There is a large piece of driftwood and 3 caves in addition to several Java ferns, other wood, cholla and leaf litter. I don't know if pea puffers are fast enough to nip and harass the apistos. MTS will be added to provide a food source for the puffer and a small school of Otos help with the algae. Anyone try this? I'd appreciate any feedback.