Please make cysts invisible after an initial "build time" of maybe 2 seconds. They should only become visible when being scanned, in reach of an obs or when they are damaged.
Reason 1: it adds a bit more of "skill" gameplay: - the marines who have to figure out where the cysts might be planted, by watching the creep spread and guessing its center point. - the alien comms who can save their cysts by carefully planting them, - the gorge's cysts make more sense since they can even use harder-to-find spots at the ceiling and at the wall.
Reason 2: Alien comm can decide whether to be greedy with cyst placement or he can do it the safe, slower way: By putting the cysts as far away from another as possible its obviously faster, but you can easily spot single patches of creep. Once you decide to tighten up the placement of cysts, your goo carpet overlaps and its harder to spot the cysts without the scan, or...
Reason 3: Give the Flamethrower more use as it can easily spot cysts with hits AoE damage. This helps him fill out a bigger niche in the marine weaponry.
Downsides: Marines will maybe struggle even more with this change, but i think that the current imbalance between kharaa and tsa is not related to cyst gameplay and should be handled by tweaking other elements of the game (hi exosuit!).