hi marcus,
glosso will need some time to fully convert to submersed. in that period you will find good growth speed but poor root griping plus the fact you feel they are reaching for the light like a hungry pig running to food, some also commented new leaf shoots visibly smaller. some people trim and for me i use pincer and tuck them back in.
actually if your concerned with it affecting photo taking and your lazy to take it out like me.. you can consider rotala family of plants.. few variants do have a tint of red and brown and more lively.
diffuser put below lily pipe is the common practice, else switch to inline, but the thou good at diffusing inline require more pressure to work and use your co2 faster...
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