The new betta has figured out that I mean food and has taken to demanding it. By flaring and dancing and getting down right spoiled.
To solve the "no lid" issue I ordered a couple BAGS of dwarf water lettuce and frogbit from a forum member. Mr Betta now has a floating mass of plants. He seems happy with this arrangement as he's built the biggest bubble nest i've ever seen in one corner of the tank. He couldn't jump out of that mess if he tried, and it'll help with keeping the water clean as well and cutting down light to the bottom which was getting some algae. pictures soon as I can.